Optical assemblies with managed connectivity

ABSTRACT

An adapter assembly includes a single-piece or two-piece multi-fiber adapter defining a recess at which a contact assembly is disposed. The adapter assemblies can be disposed within adapter block assemblies or cassettes, which can be mounted to moveable trays. Both ports of the adapters disposed within adapter block assemblies are accessible. Only one port of each adapter disposed within the cassettes are accessible. Circuit boards can be mounted within the block assemblies or cassettes to provide communication between the contact assemblies and a data network.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.16/799,328, filed Feb. 24, 2020, which is a continuation of U.S.application Ser. No. 16/025,176, filed Jul. 2, 2018, now U.S. Pat. No.10,571,641, which is a continuation of U.S. application Ser. No.15/243,510, filed Aug. 22, 2016, now U.S. Pat. No. 10,012,813, which isa continuation of U.S. application Ser. No. 14/170,157, filed Jan. 31,2014, now U.S. Pat. No. 9,423,570, which application claims the benefitof U.S. provisional application Ser. No. 61/761,048, filed Feb. 5, 2013,and titled “Optical Assemblies with Managed Connectivity;” and of U.S.provisional application Ser. No. 61/843,733, filed Jul. 8, 2013, andtitled “Optical Assemblies with Managed Connectivity;” whichapplications are incorporated herein by reference in their entirety.

BACKGROUND

In communications infrastructure installations, a variety ofcommunications devices can be used for switching, cross-connecting, andinterconnecting communications signal transmission paths in acommunications network. Some such communications devices are installedin one or more equipment racks to permit organized, high-densityinstallations to be achieved in limited space available for equipment.

Communications devices can be organized into communications networks,which typically include numerous logical communication links betweenvarious items of equipment. Often a single logical communication link isimplemented using several pieces of physical communication media. Forexample, a logical communication link between a computer and aninter-networking device such as a hub or router can be implemented asfollows. A first cable connects the computer to a jack mounted in awall. A second cable connects the wall-mounted jack to a port of a patchpanel, and a third cable connects the inter-networking device to anotherport of a patch panel. A “patch cord” cross connects the two together.In other words, a single logical communication link is often implementedusing several segments of physical communication media.

Network management systems (NMS) are typically aware of logicalcommunication links that exist in a communications network, buttypically do not have information about the specific physical layermedia (e.g., the communications devices, cables, couplers, etc.) thatare used to implement the logical communication links. Indeed, NMSsystems typically do not have the ability to display or otherwiseprovide information about how logical communication links areimplemented at the physical layer level.

SUMMARY

The present disclosure relates to communications connector assembliesand connector arrangements that provide physical layer managementcapabilities. In accordance with certain aspects, the disclosure relatesto fiber optic connector assemblies and contact assemblies.

In accordance with some aspects of the disclosure, an example contactassembly includes contact members coupled to the body so that first endsof the contact members extend from a first end of the body and secondends of the contact members extend from a second end of the body. Thefirst end of each contact member defines a first contact surface; thesecond end of each contact member defines an extension section extendingoutwardly from the body to a second contact surface; and the second endof each contact member also defines a third contact surface at anopposite side of the second contact surface from the extension section.The extension sections is angled relative to the body so that adjacentones of the second contact surfaces of the contact members are locatedcloser together than adjacent ones of the first contact surfaces of thecontact members.

In an example, the body includes a peg. In an example, the body isovermolded over the contact members. In certain implementations, thefirst and third contact surfaces define curve in an opposite directionfrom the second contact surfaces. In certain implementations, the bodyis coupled to an optical adapter so that at least the second contactsurfaces of the contact members are accessible within an interior of theoptical adapter.

In accordance with other aspects of the disclosure, an optical adapterassembly includes (a) an optical adapter; (b) a mounting recess; and (c)parallel ribs disposed at the opposite ends of the mounting recess. Theadapter defines opposing first port and second ports at which opticalplug connectors can be received. The optical adapter also has first andsecond ends that extend between the opposing ports. The mounting recessis defined in the first end of the adapter. The mounting recess extendsalong a length between opposite ends of the mounting recess. Themounting recess has a surface that is recessed relative to the first endand is configured to receive a contact assembly. The mounting recessalso defines a first aperture through the surface that leads to aninterior of the optical adapter. The parallel ribs are disposed at theopposite ends of the mounting recess. The ribs extend over less than amajority of the length of the mounting recess.

In certain examples, the mounting recess also defines a second aperturethrough the recessed surface that is smaller than the first aperture. Incertain implementations, the optical adapter assembly also includes asecond mounting recess defined in the second end of the optical adapter;and parallel ribs disposed at the opposite ends of the second mountingrecess. The second mounting recess extends along a second length betweenopposite ends of the second mounting recess. The second mounting recesshas a second surface that is recessed relative to the second end of theoptical adapter and is configured to receive a second contact assembly.The second mounting recess also defines a first aperture through thesecond surface that leads to the interior of the optical adapter. Theribs of the second plurality extend over less than a majority of thesecond length of the second mounting recess.

In certain implementations, the optical adapter is formed as a two-piecehousing with each housing piece being configured to receive a separatecontact assembly. In other implementations, the optical adapter isformed from a one-piece adapter housing receiving two contactassemblies.

In certain implementations, a contact assembly, which includes contactmembers held together by a body, is sized to fit in the mounting recessso that the body seats on the recessed surface and so that the contactmembers extend between the ribs at the opposite ends of the mountingrecess. In certain implementations, a circuit board is disposed acrossthe first end of the optical adapter. The circuit board extends acrossthe mounting recess so that the first and third contact surfaces of thecontact assembly align with contact pads on the circuit board.

In accordance with other aspects of the disclosure, a cassette includesa cassette body, ports, and an optical fiber arrangement disposed withinthe cassette body. The cassette body includes fiber management sectionsextending outwardly from opposite sides of a fiber mating plane.

For example, the cassette body can include a connection section, a firstfiber management section extending outwardly from a first port end ofthe cassette body towards a first side of the cassette body, a secondfiber management section extending outwardly from the first port end ofthe cassette body towards a second side of the cassette body, and athird fiber management section extending outwardly from a second portend of the cassette body. A first port is disposed at the first port endof the connection section between the first and second fiber managementsections. A second port is disposed at the second port end of theconnection section towards the first side of the cassette body. A thirdport is disposed at the second port end of the connection sectiontowards the second side of the cassette body. The optical fiberarrangement optically couples the first port with at least one of thesecond port and the third port.

In certain implementations, the optical fiber arrangement opticallycouples the first port with multiple of the second ports. In certainimplementations, a fourth port is disposed at the first port end of theconnection section between the first and second fiber managementsections. The optical fiber arrangement optically couples the fourthport with the third port. In examples, the optical fiber arrangementoptically couples the fourth port with multiple of the third ports. Inan example, the fiber arrangement includes loose optical fibers. Inanother example, the fiber arrangement includes optical fibers lacedonto a flexible substrate (e.g., a foil substrate).

In certain implementations, the ports are defined by optical adapters(e.g., MPO adapters). In certain implementations, the ports are definedby half-adapters.

In certain implementations, a circuit board is disposed within theconnection section of the cassette body; and contact assemblies areelectrically coupled to the circuit board. Each contact assembly alignswith one of the ports.

In certain implementations, management spools are disposed within themanagement sections. Each management spool includes a bend radiuslimiter and retention flanges extending outwardly from the bend radiuslimiter. In examples, each management spool has a height of no more thanabout 0.07 inches.

A variety of additional inventive aspects will be set forth in thedescription that follows. The inventive aspects can relate to individualfeatures and to combinations of features. It is to be understood thatboth the forgoing general description and the following detaileddescription are exemplary and explanatory only and are not restrictiveof the broad inventive concepts upon which the embodiments disclosedherein are based.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of the description, illustrate several aspects of the presentdisclosure. A brief description of the drawings is as follows:

FIG. 1 is a schematic diagram showing two optical connectors withphysical layer storage inserted at an optical adapter having mediareading interfaces to access the physical layer storage of theconnectors;

FIG. 2 is a perspective view of an example optical adapter and a contactassembly configured in accordance with aspects of the presentdisclosure;

FIG. 3 is an exploded view of the optical adapter of FIG. 2;

FIG. 4 is a top plan view of the optical adapter of FIG. 2;

FIG. 5 is an axial cross-sectional view taken along the 5-5 line of FIG.4;

FIGS. 6-10 illustrate an example of the optical adapter of FIG. 2;

FIGS. 11-14 illustrate an example of the contact assembly of FIG. 2;

FIG. 15 illustrates multiple contact assemblies mounted to a carrierstrip during manufacturing of the contact assemblies;

FIG. 16 is a perspective view of an example adapter block assemblyholding multiple optical adapters and contact assemblies;

FIG. 17 is an exploded view of the adapter block assembly of FIG. 16;

FIGS. 18-21 illustrate additional views of the adapter block assembly ofFIG. 16;

FIG. 22 is a perspective view of another example optical adapter andcontact assembly configured in accordance with aspects of the presentdisclosure;

FIG. 23 is an exploded view of the optical adapter and contactassemblies of FIG. 22;

FIG. 24 is a top plan view of the optical adapter of FIG. 22;

FIG. 25 is an axial cross-sectional view taken along the 25-25 line ofFIG. 24;

FIGS. 26-33 illustrate one example adapter piece of the example opticaladapter of FIG. 22;

FIG. 34 is an exploded view of another example adapter block assemblyholding multiple optical adapters and contact assemblies of FIG. 22;

FIG. 35 is a cross-sectional view of the adapter block assembly of FIG.34 taken along an insertion axis of one opposing pair of ports;

FIG. 36 is a perspective view of the adapter block assembly of FIG. 34assembled together and exploded upwardly from an example tray;

FIG. 37 shows the adapter block assembly and tray of FIG. 36 assembledtogether;

FIG. 38 is a perspective view of an example adapter cassette configuredto couple first optical plug connectors to second optical plugconnectors;

FIG. 39 is an exploded view of the adapter cassette of FIG. 38;

FIG. 40 is a plan view of the adapter cassette of FIG. 38;

FIG. 41 is an exploded view of an example adapter assembly including aport and a spring-biased ferrule assembly facing the port;

FIG. 42 is an axial cross-sectional view of the adapter assembly of FIG.41;

FIG. 43 illustrates one example fiber arrangement disposed within thecassette to couple ferrule assemblies of first adapter assemblies toferrule assemblies of second adapter assemblies;

FIG. 43A is an enlarged view of a portion of FIG. 43;

FIG. 44 is a perspective view of the cassette of FIG. 38 explodedupwardly from an example tray; and

FIG. 45 shows the cassette and tray of FIG. 44 assembled together;

FIGS. 46-47 show an alternative contact assembly mounted to analternative example adapter;

FIG. 48 illustrates an example tray arrangement including anotherexample tray to which any of the adapter block assemblies or cassettesdisclosed herein can be mounted;

FIG. 49 is a top perspective view of another example adapter blockassembly holding multiple optical adapters and contact assemblies ofFIG. 22;

FIG. 50 is a bottom perspective view of the adapter block assembly ofFIG. 49;

FIG. 51 is an exploded view of the adapter block assembly of FIG. 49;

FIG. 52 is a perspective view of block arrangement suitable for use withthe adapter block assembly of FIG. 49;

FIG. 53 is a perspective view of an example half adapter;

FIG. 54 is a perspective view of an example cover arrangement suitablefor use with the adapter block assembly of FIG. 49;

FIG. 55 is a transverse cross-section of the cover arrangement of FIG.54;

FIG. 56 is an example tray suitable for mounting any of the adapterblock assemblies or cassettes disclosed herein;

FIG. 57 shows an example cassette disposed on the tray of FIG. 56;

FIG. 58 is an exploded view of FIG. 57;

FIG. 59 is an exploded view of the cassette of FIG. 57;

FIG. 60 is a cross-sectional view of the cassette of FIG. 57;

FIG. 61 shows the cassette of FIG. 57 with the cover and some interiorcomponents removed;

FIG. 62 is an exploded view of an example half adapter;

FIG. 63 illustrates an example spool arrangement;

FIG. 64 is a top perspective view of another example cassette;

FIG. 65 is a bottom perspective view of the cassette of FIG. 64;

FIG. 66 shows an interior side of a top member of the cassette of FIG.64;

FIG. 67 is a plan view of FIG. 66 showing example cabling;

FIG. 68 is a perspective view of the top member of FIG. 66 with amanagement spool exploded from the top member;

FIG. 69 is a plan view of the management spool of FIG. 68;

FIG. 70 is a perspective view of a bottom member of the cassette of FIG.64;

FIG. 71 is a perspective view of another example tray suitable formounting any of the adapter block assemblies or cassettes disclosedherein; and

FIG. 72 illustrates one example optical fiber arrangement including aplurality of optical fibers disposed on a flexible substrate.

DETAILED DESCRIPTION

Reference will now be made in detail to exemplary aspects of the presentdisclosure that are illustrated in the accompanying drawings. Whereverpossible, the same reference numbers will be used throughout thedrawings to refer to the same or like parts.

In general, media segments connect equipment of the communicationsnetwork. Non-limiting examples of media segments include optical cables,electrical cables, and hybrid cables. This disclosure will focus onoptical media segments. The media segments may be terminated withoptical plug connectors, media converters, or other optical terminationcomponents.

FIG. 1 is a schematic diagram of one example connection system 100including a connector assembly (e.g., optical adapters, electricalsockets, wireless readers, etc.) 110 at which communications signalsfrom a first media segment (e.g., an optical fiber, an electricalconductor, a wireless transceiver, etc.) 122 pass to another mediasegment 132. In some implementations, the media segments 122, 132 areterminated by connector arrangements 120, 130, respectively. The exampleconnector assembly 110 connects segments of optical communications mediain an optical network. In other implementations, however, the connectorassembly 110 can connect electrical segments, wireless segments, or somecombination thereof.

The connector assembly 110 includes a fiber optic adapter defining atleast one connection opening 111 having a first port end 112 and asecond port end 114. A sleeve (e.g., a split sleeve) 103 is arrangedwithin the connection opening 111 of the adapter 110 between the firstand second port ends 112, 114. Each port end 112, 114 is configured toreceive a connector arrangement 120. Each fiber connector arrangement120, 130 includes a ferrule 124, 134 through which optical signals fromthe optical fiber 122, 132, respectively, pass. The ferrules 124, 134are held and aligned by a sleeve 103 to allow optical signals to passbetween the ferrules 124, 134. The aligned ferrules 124, 134 of theconnector arrangements 120, 130 create an optical path along which thecommunication signals may be carried.

In accordance with aspects of the disclosure, the communications networkis coupled to or incorporates a data management system that providesphysical layer information (PLI) functionality as well as physical layermanagement (PLM) functionality. As the term is used herein, “PLIfunctionality” refers to the ability of a physical component or systemto identify or otherwise associate physical layer information with someor all of the physical components used to implement the physical layerof the communications network. As the term is used herein, “PLMfunctionality” refers to the ability of a component or system tomanipulate or to enable others to manipulate the physical componentsused to implement the physical layer of the communications network(e.g., to track what is connected to each component, to traceconnections that are made using the components, or to provide visualindications to a user at a selected component).

As the term is used herein, “physical layer information” refers toinformation about the identity, attributes, and/or status of thephysical components used to implement the physical layer of thecommunications network. Physical layer information of the communicationsnetwork can include media information, device information, and locationinformation. Media information refers to physical layer informationpertaining to cables, plugs, connectors, and other such physical media.Non-limiting examples of media information include a part number, aserial number, a plug type, a conductor type, a cable length, cablepolarity, a cable pass-through capacity, a date of manufacture, amanufacturing lot number, the color or shape of the plug connector, aninsertion count, and testing or performance information. Deviceinformation refers to physical layer information pertaining to thecommunications panels, inter-networking devices, media converters,computers, servers, wall outlets, and other physical communicationsdevices to which the media segments attach. Location information refersto physical layer information pertaining to a physical layout of abuilding or buildings in which the network is deployed.

In accordance with some aspects, one or more of the components (e.g.,media segments, equipment, etc.) of the communications network areconfigured to store physical layer information pertaining to thecomponent as will be disclosed in more detail herein. Some componentsinclude media reading interfaces that are configured to read storedphysical layer information from the components. The physical layerinformation obtained by the media reading interface may be communicatedover the network for processing and/or storage.

For example, the connector assembly 110 of FIG. 1 can be configured tocollect physical layer information from the connector arrangements 120,130 terminating one or more of the media segments 122, 132. In someimplementations, the first connector arrangement 120 may include astorage device 125 that is configured to store physical layerinformation pertaining to the segment of physical communications media122 and/or to the first connector arrangement 120. In certainimplementations, the connector arrangement 130 also includes a storagedevice 135 that is configured to store information pertaining to thesecond connector arrangement 130 and/or to the second optic cable 132terminated thereby.

In one implementation, each of the storage devices 125, 135 isimplemented using an EEPROM (e.g., a PCB surface-mount EEPROM). In otherimplementations, the storage devices 125, 135 are implemented usingother non-volatile memory device. Each storage device 125, 135 isarranged and configured so that it does not interfere or interact withthe communications signals communicated over the media segments 122,132.

In accordance with some aspects, the adapter 110 is coupled to at leasta first media reading interface 116. In certain implementations, theadapter 110 also is coupled to at least a second media interface 118. Incertain implementations, the adapter 110 is coupled to multiple mediareading interfaces. In an example, the adapter 110 includes a mediareading interface for each port end defined by the adapter 110. Inanother example, the adapter 110 includes a media reading interface foreach connection opening 111 defined by the adapter 110. In otherimplementations, the adapter 110 can include any desired number of mediareading interfaces 116, 118.

In some implementations, at least the first media reading interface 116is mounted to a printed circuit board 115. In some implementations, theprinted circuit board 115 also can include the second media readinginterface 118. The printed circuit board 115 of the adapter 110 can becommunicatively connected to one or more programmable processors and/orto one or more network interfaces. The network interface may beconfigured to send the physical layer information to a physical layerdata management network. Examples of data management networks can befound in U.S. Provisional Application No. 61/760,816, filed Feb. 5,2013, and titled “Systems and Methods for Associating LocationInformation with a Communication Sub-Assembly Housed within aCommunication Assembly,” the disclosure of which is hereby incorporatedherein by reference.

When the first connector arrangement 120 is received in the first portend 112 of the adapter 110, the first media reading interface 116 isconfigured to enable reading (e.g., by an electronic processor) of theinformation stored in the storage device 125. The information read fromthe first connector arrangement 120 can be transferred through theprinted circuit board 115 to the physical layer data management network.When the second connector arrangement 130 is received in the second portend 114 of the adapter 110, the second media reading interface 118 isconfigured to enable reading (e.g., by an electronic processor) of theinformation stored in the storage device 135. The information read fromthe second connector arrangement 130 can be transferred through theprinted circuit board 115 or another circuit board to the physical layerdata management network.

In some such implementations, the storage devices 125, 135 and the mediareading interfaces 116, 118 each include at least three (3) leads—apower lead, a ground lead, and a data lead. The three leads of thestorage devices 125, 135 come into electrical contact with three (3)corresponding leads of the media reading interfaces 116, 118 when thecorresponding media segment is inserted in the corresponding port. Inother example implementations, a two-line interface is used with asimple charge pump. In still other implementations, additional leads canbe provided (e.g., for potential future applications). Accordingly, thestorage devices 125, 135 and the media reading interfaces 116, 118 mayeach include four (4) leads, five (5) leads, six (6) leads, etc.

FIGS. 2-5 illustrate one example adapter assembly 200 including anexample optical adapter 210 and an example contact assembly 230 suitablefor mounting to the optical adapter 210 as a media reading interface.The adapter assembly 200 has a first port end 201, a second port end202, a first mounting end 203, a second mounting end 204, a first side205, and a second side 206. The optical adapter 210 defines a port 212for receiving an optical connector (e.g., an MPO-type connector, anLC-type connector, an SC-type connector, and LX.5-type connector, etc.)at each of the port ends 201, 202. The optical adapter 210 also definesa mounting recess 215 sized and shaped to receive the contact assembly230.

In some implementations, multiple contact assemblies 230 can be mountedto the optical adapter 210. For example, as shown in FIG. 3, a firstcontact assembly 230A can be mounted and a second contact assembly 230Bcan be mounted to the optical adapter 210. In the example shown, thefirst contact assembly 230A is mounted at a mounting recess 215 definedat the first mounting end 203 of the adapter assembly 200 and the secondcontact assembly 230B is mounted at a mounting recess defined at thesecond mounting end 204 of the adapter assembly 200.

In certain implementations, each mounting recess 215 has a recessedsurface on which the respective contact assembly 230 can seat. Forexample, each contact assembly 230 includes a plurality of contactmembers 235 coupled together at a body 231, which seats on the recessedsurface (see FIG. 5). The mounting recess 215 also defines a firstaperture 217 through the recessed surface that leads to an interior ofthe adapter body 211, which is accessible through the ports 212 (FIG.5). Portions of the contacts 235 extend through the first aperture 217towards the interior of the adapter body 211. A second aperture 218 alsois defined in the recessed surface spaced from the first aperture 217(FIG. 3). The second aperture 218 is sized to receive a peg 232 of thecontact assembly body 231 to help hold the contact assembly 230 withinthe mounting recess 215 (see FIG. 5).

FIGS. 6-10 illustrate one example optical adapter 210 suitable for usein the adapter assembly 200 of FIGS. 2-5. The optical adapter 210includes an adapter body 211 defining first and second ports 212 atopposite ends 201, 202 of the adapter body 211. In otherimplementations, however, the optical adapter body 211 may define agreater number of ports 212 at one or both ends 201, 202 of the adapterbody 211. The optical adapter 210 shown includes an MPO-type adapter. Inother implementations, however, the optical adapter 210 can be anydesired type of optical adapter.

Each port 212 of the optical adapter body 211 is configured to receivean optical plug (e.g., see optical plug 180 of FIG. 17) along aninsertion axis I (FIG. 10). In some implementations, the adapter body211 includes latching arms 213 at each port 212 that are configured tolatch around the received optical plug to hold the plug to the port 212.In certain implementations, each port 212 defines a key area 212A sizedand shaped to accommodate a keying feature of the optical plug. Incertain implementations, the optical adapter body 211 also includesshroud walls 214 that extend outwardly from the port ends 201, 202 ofthe adapter body 211 at opposite sides 205, 206 of the adapter body 211.The shroud walls 214 aid in protecting the port 212 and/or theconnection between the adapter 210 and the plug. In the example shown,the shroud walls 214 define a concave curve facing towards the port 212.

As discussed above, the adapter body 211 also defines one or moremounting recesses 215 each having a recessed surface, a first aperture217, and a second aperture 218. The body 231 and contacts 235 of eachcontact assembly 230 fit within a mounting recess 215. In certainimplementations, an example mounting recess 215 defines a first portion215 a sized to accommodate the body 231 of the contact assembly 230 anda second portion 215 b sized to accommodate the contacts 235 of thecontact assembly 230 (see FIG. 9). In certain implementations, ribs 216(FIGS. 6 and 7) can be provided at one or both ends of the mountingrecess 215 to aid in maintaining separation of the ends of the contacts235 (e.g., see FIG. 4).

In certain implementations, the adapter body 211 includes one or morealignment features that aid in positioning and/or orienting the adapterbody 211 on a circuit board, adapter block assembly, tray, drawer, orother such structure. In some implementations, the adapter body 211includes mounting pegs 219 extending from the first and second mountingends 203, 204. In certain implementations, the mounting pegs 219 extendoutwardly from areas around the mounting recesses 215. In the exampleshown, four mounting pegs 219 extend outwardly from the mounting ends203, 204 of the adapter body 211. In other implementations, a greater orfewer number of mounting pegs 219 can be utilized.

In some implementations, an alignment peg 220 also can extend outwardlyfrom one or both mounting ends 203, 204 of the adapter body 211. In theexample shown, each mounting end 203, 204 is associated with a singlealignment peg 220. In other implementations, however, additionalmounting pegs 220 can be provided. In the example shown, the alignmentpeg 220 at the first mounting end 203 is disposed at an opposite side205, 206 of the adapter body 211 from the alignment peg 220 at thesecond mounting end 204. In certain implementations, the adapter body211 defines cutout regions or slots 221 at the sides 205, 206 of theadapter body 211. In certain implementations, the cutout regions 221 canaid in positioning the adapter body 211 at a mounting structure.

FIGS. 11-14 illustrate an example contact assembly 230 suitable for usein the adapter assembly 200 of FIGS. 2-5. As discussed above, thecontact assembly includes a body 231 holding one or more contact members235. The body 231 includes an alignment peg 232 that is configured tofit into the adapter aperture 218 to secure the contact assembly 230 tothe optical adapter 210. The body 231 also defines a recessed side 234that forms shoulders 233. A longer section of the contact members 235extends from the recessed side 234 of the body 231 between the shoulders233 and a shorter section of the contact members 235 extends from anopposite side of the body 231.

The shorter section of each contact member 235 defines a first contactsurface 236. In certain implementations, the first contact surface 236is defined by a bump or peak formed in the shorter section (see FIG.11). The longer section of each contact member 235 defines a secondcontact surface 238 and a third contact surface 239. In certainimplementations, the second and third contact surfaces 238, 239 aredefined by bumps or peaks formed in the longer section (see FIG. 12). Inthe example shown, the second contact surfaces 238 curve in an oppositedirection from the first and third contact surfaces 236, 239.

In certain implementations, the longer sections also include extensions237 that extend between the body 231 and the second contact surfaces238. The longer sections of the contact members 235 can deflect alongthe extensions 237. For example, the second and third contact surfaces238, 239 can deflect relative to the first contact surfaces 236. In someimplementations, the contact members 235 deflect along parallel paths.In certain implementations, the contact members 235 do not deflectlaterally towards each other. In some implementations, the contactmembers 235 extend generally parallel to each other. In otherimplementations, however, portions of the contact members 235 can beangled to extend towards and/or away from each other. For example, asshown in FIG. 13, the extensions 237 can be angled towards each other sothat contact members 235 are disposed closer to each other at the secondcontact surfaces 238 than at the recessed section 234 of the body 231.The contact members 235 also can be angled outwardly so that the thirdcontact surfaces 239 are spaced farther apart than the second contactsurfaces 238.

As shown in FIG. 15, contact assemblies 230 can be manufactured usingcarrier strip arrangement 240. Each carrier strip arrangement 240defines sequencing holes 242 at opposite sides. The sequencing holes 242can be engaged by a machine (e.g., by as spiked wheel, etc.) to advancethe carrier strip arrangement 240 in a feed direction F. Material isremoved from the carrier strip 240 to form contact members 235 extendingbetween two strips 241. For example, material can be removed by cutting,stamping, laser cutting, etching, or any other removal process. Thecontact members 235 of a first contact assembly 230 are spaced along thestrips 241 in the feed direction F. During the manufacturing process, abody 231 is formed around the contact members 235 of each contactassembly 230. For example, in certain implementations, the contactmembers 235 of each contact assembly 230 are overmolded together. Inother implementations, the contact members 235 can be sandwiched betweena two-piece body 231.

FIGS. 16-21 illustrate an example adapter block assembly 250 that holdsone or more adapter assemblies 200. The adapter block assembly 250 has afirst end 251, a second end 252, a top 253, a bottom 254, a first side255, and a second side 256.

The first and second ends 251, 252 provide access to the ports 212 ofthe adapter assemblies 200. The sides 255, 256 of the adapter blockassembly 250 are configured to mount the adapter block assembly 250 to atray, blade, drawer, or other mounting structure (hereinafter “tray”).For example, the sides 255, 256 of the adapter block assembly 250 caninclude a retention member 259.

In certain implementations, labeling 258 can be provided at the firstand/or second ends 251, 252. For example, a label 258 can be provided ateach port 212. In certain implementations, a light indicator 257 alsocan be provided at the first and/or second ends 251, 252. In someimplementations, a single light indicator 257 can be provided at one orboth ends 251, 252 to identify the adapter block assembly. In otherimplementations, each port 212 may be associated with a respective lightindicator 257 to identify the port 212 (e.g., for tracing or markingpurposes).

The adapter block assembly 250 includes one or more adapter assemblies200 mounted to a circuit board arrangement 260 within a housing 270. Inthe example shown in FIG. 17, the housing 270 includes a two-piecehousing 270A, 270B that defines an interior in which to hold the adapterassemblies 200 and circuit boards 260. In other implementations, thehousing 270 can be formed of greater or fewer pieces and may or may notfully surround the adapter assemblies 200 and circuit boards 260. In theexample shown, the housing 270 hold eight adapter assemblies 200. Inother implementations, the housing 270 may hold a greater or lessernumber of adapter assemblies 200.

The circuit board arrangement 260 includes a controller (e.g.,processor, microprocessor, etc.) to manage obtaining information fromthe contact assemblies 230 at each adapter block port. 212. The circuitboard arrangement 260 also includes a circuit board connector 265 (FIG.19) that is configured to connect the controller to a data managementnetwork as will be described in more detail herein. In someimplementations, the circuit board arrangement 260 includes a firstcircuit board 260A that extends over the first mounting end 203 of theadapter assemblies 200. The circuit board 260A includes contact pads 262that align with the first and third contact surfaces 236, 239 of thecontact assemblies 230 mounted to the first mounting ends 203 of theadapter assemblies 200. The first circuit board 260A also may includethe controller.

The circuit board connector 265 may extend downwardly from the circuitboard 260A, past the adapter assemblies 200, and towards the bottom 254of the housing 270.

In some implementations, the adapter assemblies 200 include contactassemblies 230 mounted to both mounting ends 203, 204 of the adapterassemblies 200. In such implementations, the circuit board arrangement260 also includes at least a second circuit board 260B that extends overthe second mounting end 204 of one or more of the adapter assemblies200. The second circuit board 260B also includes contact pads 262 thatalign with the first and third contact surfaces 236, 239 of the contactassemblies 230 mounted to the second mounting ends 204 of the one ormore adapter assemblies 200. In certain implementations, the secondcircuit board 260B electrically connects to the first circuit board260A. In other implementations, the second circuit board 260Belectrically connects to the electrical circuit or component to whichthe first circuit board 260A connects.

In some implementations, the second circuit board 260B extends acrossall of the adapter assemblies 200 in the adapter block assembly 250. Inother implementations, however, the second circuit board 260B extendsacross the second mounting ends 204 of only some of the adapterassemblies 200. In some such implementations, a third circuit board 260Cmay extend across the second mounting ends 204 of a remainder of theadapter assemblies 200. The third circuit board 260C also includescontact pads 262 that align with the first and third contact surfaces236, 239 of the contact assemblies 230 mounted to the second mountingends 204 of the remainder of the adapter assemblies 200.

In certain implementations, the third circuit board 260C is aligned withand spaced from the second circuit board 260B. For example, the circuitboard connector 265 of the first circuit board 260A may be positioned toextend downwardly between the second and third circuit boards 260B, 260C(see FIG. 17). In certain implementations, the third circuit board 260Celectrically connects to the first circuit board 260A. In otherimplementations, the third circuit board 260C electrically connects tothe electrical circuit or component to which the first circuit board260A connects.

In some implementations, the housing 270 includes a first housing piece270A and a second housing piece 270B that are configured to fit togetherto form the housing 270. In the example shown in FIG. 17, the firsthousing piece 270A is identical to the second housing piece 270B. Incertain implementations, each of the housing pieces 270A, 270B definesone of the first and second ends 251, 252 of the adapter block assembly250; and the housing pieces 270A, 270B cooperate to define the top 253,bottom 254, first side 255, and second side 256. In otherimplementations, the housing 270 can be divided differently so that eachhousing piece 270A, 270B can define a complete side 255, 256, a completetop 253 or bottom 254, or partials of one or more sides.

Each housing piece 270A, 270B includes a body 271 defining openings 272aligned with the ports 212 of the adapter assemblies 200. In someimplementations, the adapter assemblies 200 are evenly spaced within thehousing 270 and, accordingly, the openings 272 are evenly spaced alongthe first and second ends 251, 252 of the housing 270. In otherimplementations, the adapter assemblies 200 and, hence, the openings 272can be separated into two or more groups. In the example shown, theopenings 272 of the housing 270 are grouped in pairs along the length Lof the housing 270 (FIG. 18).

Each housing piece 270A, 270B is configured to couple to the otherhousing piece 270A, 270B. For example, in some implementations, eachhousing piece 270A, 270B includes a peg, latch, or other fastener 273that aligns with a corresponding opening 274 on the other housing piece270A, 270B at inwardly facing edges of the housing pieces 270A, 270B. Inthe example shown, each housing piece 270A, 270B includes a peg 273disposed at one side 255, 256 of the housing piece 270A, 270B anddefines a hole 274 at the opposite side 255, 256 of the housing piece270A, 270B. The peg 273 is configured to friction-fit, snap-fit, beadhesively fixed, be welded, or be otherwise secured within the hole274.

In certain implementations, one or more alignment arrangements 275 canbe disposed at the inwardly facing edges of the housing pieces 270A,270B. For example, the alignment arrangements 275 can include smallerpegs 275 a and/or holes 275 b that align with pegs and holes of theother piece 270A, 270B. In certain implementations, each alignmentarrangement 275 includes one peg 275 a and one hole 275 b disposedlaterally adjacent each other. In other implementations, each alignmentarrangement 275 includes only one or more pegs 275 a or only one or moreholes 275 b.

In some implementations, the housing pieces 270A, 270B cooperate todefine a connector egress 276 through which the circuit board connector265 can extend partially out of the housing 270. In someimplementations, the connector egress 276 can be disposed at an inwardlyrecessed location relative to the bottom 254 of the adapter blockassembly 250. The connector egress 276 is configured to inhibitcontaminants (e.g., dust) from entering the housing 270. In certainimplementations, one or more alignment arrangements 275 can be providedon the connector egress 276 (see FIG. 17).

In some implementations, each housing piece 270A, 270B is configured tosecure the circuit boards 260 within the interior of the housing 270. Insome implementations, each housing piece 270A, 270B defines guides 277in which the circuit boards 260 can be inserted to secure the circuitboards 260 within the housing 270. In the example shown in FIG. 17,guides 277 are provided at opposite sides of internal sidewalls of eachhousing piece 270A, 270B. For example, the first circuit board 260A canbe inserted opposing guides 277 disposed at a top of each housing piece270A, 270B. One end of the second circuit board 260B can be insertedinto the guide 277 provided at the second side 256 of the housing piece270A, 270B and one end of the third circuit board 260C can be insertedinto the guide 277 provided at the first side 255 of the housing piece270A, 270B.

In some implementations, the adapter block assembly 250 is configured tobe mounted to a tray. For example, one or more alignment and/orsecurement structures can be provided at exterior surfaces of theadapter block assembly 250. In the example shown in FIG. 17, eachhousing piece 270A, 270B includes a ramped structure 278 and a tabstructure 279 that extend outwardly from opposite sides 255, 256 of thehousing body 271. When the housing pieces 270A, 270B are assembled, theretention member 259 is disposed between two ramped structures 278 andtwo tab structures 279.

Referring to FIGS. 19-21, inserting optical plug connectors 180 into theports 212 of the adapter block assembly 250 provides a connectionbetween storage 182 provided on the optical plug connectors 180 and thedata network via the contact assemblies 230 of the adapter assemblies200, the circuit boards 260, and the electrical circuit to which thecircuit boards 260 couple. Each optical plug connector 180 includes asignal conveying section (e.g., one or more optical fibers, one or moreelectrical connectors, etc.) 181. At least some of the optical plugconnectors 180 includes memory (e.g., an EEPROM mounted to a circuitboard chip) 182 disposed on the optical plug connector 180. In oneexample, the memory 182 is disposed in a keying region of the opticalplug connector 180.

FIG. 20 illustrates a first optical plug connector 180A fully insertedinto one port of one of the adapter assemblies 200 of the adapter blockassembly 250 and a second optical plug connector 180B partially insertedinto an opposing port of the adapter assembly 200. The memory 182 of thefirst optical plug connector 180A aligns with the second contactsurfaces 238 of one of the contact assemblies 230 mounted to the adapterassembly 200. Physical contact between the first plug connector 180A(e.g., the memory 182) and the second contact surfaces 238 deflects theextensions 237 of the contact assembly 230 so that the third contactsurfaces 239 touch or swipe along the contact pads 262 of the firstcircuit board 260A of the adapter block assembly 250. Accordingly,information (e.g., PLI) can be communicated from the memory 182 to adata management network (e.g., through the contact assembly 230, throughthe circuit board 260A, through the circuit board connector 265, andthrough the electrical circuit). In other implementations, the datamanagement network and/or a local processor can detect the closing ofthe circuit (i.e., when the third contact surfaces 239 touch or swipealong the contact pads 262) to detect the presence of the plug connector180A within the port 212.

The second optical plug connector 180B has only been partially insertedinto the respective port 212. The second optical plug connector 180B isnot yet touching the second contact surfaces 238 of the other contactassembly 230 mounted to the adapter assembly 200. Because the plugconnector 180B is not biasing the second contact surfaces 238 towardsthe exterior of adapter assembly 200, the third contact surfaces 239 ofthe other contact assembly 230 are not touching the contact pads 262 onthe second circuit board 260B. Accordingly, the data management networkand/or a local processor can determine that the circuit is open and,thereby, determine that the plug connector 180B is not yet presentwithin the port 212 (i.e., at least not sufficiently present to enablereading of data stored in memory 182 of the second plug connector 180B).

Additional information about how physical layer information can be readfrom the plug connectors by the contact assemblies at adapters can befound in U.S. Publication No. 2011-0262077, now U.S. Pat. No. 8,690,593the disclosure of which is hereby incorporated herein by reference.

FIGS. 22-25 illustrate one example adapter assembly 300 including anexample optical adapter 310 to which one or more contact assemblies 230can be mounted. The adapter assembly 300 has a first port end 301, asecond port end 302, a first mounting end 303, a second mounting end304, a first side 305, and a second side 306. The optical adapter 310defines a port 312 for receiving an optical connector (e.g., an MPO-typeconnector, an LC-type connector, an SC-type connector, and LX.5-typeconnector, etc.) at each of the port ends 301, 302. In the exampleshown, the optical adapter 310 includes an MPO-type optical adapter. Theoptical adapter 310 also defines a mounting recess 315 sized and shapedto receive the contact assembly 230.

In some implementations, multiple contact assemblies 230 can be mountedto the optical adapter 310. For example, as shown in FIG. 23, a firstcontact assembly 230A and a second contact assembly 230B can be mountedto the optical adapter 310. In the example shown, the first contactassembly 230A is mounted at a mounting recess 315 defined at the firstmounting end 303 of the adapter assembly 300 and the second contactassembly 230B is mounted at a mounting recess 315 defined at the secondmounting end 304 of the adapter assembly 300.

In certain implementations, each mounting recess 315 has a recessedsurface on which the body 231 of the respective contact assembly 230 canseat. The mounting recess 315 also defines a first aperture 317 throughthe recessed surface that leads to an interior of the adapter body 311,which is accessible through the ports 312. Portions of the contacts 235extend through the first aperture 317 towards the interior of theadapter body 311 (FIG. 25). In certain implementations, a secondaperture 318 (FIG. 23) also is defined in the recessed surface spacedfrom the first aperture 317. The second aperture 318 can be sized toreceive a peg 232 of the contact assembly body 231 to help hold thecontact assembly 230 within the mounting recess 315.

In some implementations, the adapter 310 is formed from multiple pieces.In the example shown in FIG. 23, the adapter 310 is formed from a firstpiece 310A and a second piece 310B that fit together to form the adapter310. In other implementations, the adapter 310 can be formed from agreater number of pieces. In some implementations, the first and secondpieces 310A, 310B are identically formed. In other implementations, theadapter pieces 310A, 310B have different shapes or sizes that fittogether to form the adapter 310.

As shown in FIG. 23, each adapter piece 310A, 310B includes a body 311extending from an open end to the port 312. The open ends of the adapterpieces 310A, 310B fit together to form the adapter 310. In someimplementations, the adapter pieces 310A, 310B include attachmentfeatures that enable the adapter pieces 310A, 310B to fit together. Forexample, in some implementations, edges of the open end of each body 311include attachment pegs 327 and openings 328 configured to receive theattachment pegs 327 of the opposing adapter body 311. In otherimplementations, the open ends can be glued, welded, soldered, orotherwise fixed together.

In certain implementations, the second adapter piece 310B is configuredto be rotated 180° about the port insertion axis relative to the firstadapter piece 310A. The body 311 includes a flange 323 extendingoutwardly from the open end of the body 311 at one of the mounting ends303, 304 of the adapter 310. The body 311 also defines a cutout region324 extending inwardly from the open end towards the port 312 at anopposite one of the mounting ends 303, 304. The flange 323 of the firstadapter piece 310A is sized to fit within the cutout region 324 of thesecond adapter piece 310B and the flange 323 of the second adapter piece310B is sized to fit within the cutout region 324 of the first adapterpiece 310A. The flange 323 defines contoured sides 326 that fit (e.g.,slide) within guides 325 defined in sides of the cutout region 324.

The contact assemblies 230A, 230B fit into mounting recesses 315 definedin the flanges 323 and bodies 311 of the adapter pieces 310A, 310B. Inthe example shown in FIG. 23, a first aperture 317 extends through themounting recess 315 to an interior of the adapter body 311 and a secondaperture 318 extends through the mounting recess 315 and through theflange 323 (see FIG. 23). Pegs 232 of the contact assembly body 231 mayfit in the second apertures 318. Portions of the contact members 235 mayextend through the first apertures 317 (see FIG. 25). Ribs 316 areprovided at opposite ends of the mounting recess 315 to separate contactmembers 235 of the contact assembly 230 mounted thereat (see FIG. 22).

FIGS. 26-33 illustrate one example structure suitable for use as housingpiece 310A, 310B of FIGS. 22-25. Each structure is configured to receivean optical plug (e.g., see optical plug 180 of FIG. 34) along aninsertion axis of the respective port 312. In some implementations, theadapter body 311 includes latching arms 313 at the port 312 that areconfigured to latch around the received optical plug 180 to hold theplug at the port 312. In certain implementations, each port 312 definesa key area 312A (FIG. 28) sized and shaped to accommodate a keyingfeature of the optical plug 180. In certain implementations, the opticaladapter body 311 also includes shroud walls 314 that extend outwardlyfrom the port 312 at opposite sides 305, 306 of the adapter body 311.The shroud walls 314 aid in protecting the port 312 and/or theconnection between the adapter 310 and the plug 180. In the exampleshown, the shroud walls 314 define a concave curve facing towards theport 312.

In certain implementations, the adapter body 311 includes one or morealignment features that aid in positioning and/or orienting the adapterbody 311 on a circuit board, adapter block assembly, or tray. In someimplementations, the adapter body 311 includes mounting pegs 319extending from the first and second mounting ends 303, 304. In certainimplementations, the mounting pegs 319 extend outwardly from areasaround the mounting recesses 315. In the example shown, two mountingpegs 319 extend outwardly from the mounting ends 303, 304 of the adapterbody 311. In other implementations, a greater or fewer number ofmounting pegs 319 can be utilized. In some implementations, an alignmentpeg 320 also can extend outwardly from one or both mounting ends 303,304 of the adapter body 311. In the example shown, each structureincludes a single alignment peg 320. In other implementations, however,additional alignment pegs 320 can be provided.

FIGS. 34-35 illustrate an example adapter block assembly 350 that holdsone or more adapter assemblies 300. First and second ends of the adapterblock assembly 350 provide access to the ports 312 of the adapterassemblies 300. Optical plug connectors 180 can be inserted through theends of the adapter block assembly 350 and into the ports 312. Incertain implementations, labeling can be provided at each port 312. Incertain implementations, a light indicator also can be provided at eachport 312. Sides of the adapter block assembly 350 are configured tomount the adapter block assembly 350 to a tray.

The adapter block assembly 350 includes one or more adapter assemblies300 mounted to a circuit board arrangement 360 within a housing 370. Thepieces 310A, 310B of the adapter assemblies 300 are shown exploded inFIG. 34. However, the pieces 310A, 310B are assembled together andcoupled to the circuit board arrangement 360 when disposed within thehousing 370. In the example shown in FIG. 34, the housing 370 includes atwo-piece housing 370A, 370B that defines an interior in which to holdthe adapter assemblies 300 and circuit board arrangement 360. In otherimplementations, the housing 370 can be formed of greater or fewerpieces. In the example shown, the housing pieces 370A, 370B aresubstantially identical to the housing pieces 270A, 270B of FIG. 17.

The circuit board arrangement 360 includes a controller that managesobtaining information from the contact assemblies 230 of the adapterassemblies 300. In some implementations, the circuit board arrangement360 includes a first circuit board 360A that extends over the firstmounting end 303 of the adapter assemblies 300. The circuit board 360Aincludes contact pads that align with the first and third contactsurfaces 236, 239 of the contact assemblies 230 mounted to the firstmounting ends 303 of the adapter assemblies 300. In certainimplementations, the first circuit board 360A includes the controller.The circuit board 360A also includes a circuit board connector thatextends from the circuit board 360A, past the adapter assemblies 300,towards the bottom of the adapter block assembly 350. The circuit boardconnector is configured to couple to an electrical circuit or componentto electrically couple the contact assemblies 230 to a data managementnetwork as will be described in more detail herein.

In some implementations, the adapter assemblies 300 include contactassemblies 230 mounted to both mounting ends 303, 304 of the adapterassemblies 300. In such implementations, the circuit board arrangement360 also includes at least a second circuit board 360B that extends overthe second mounting end 304 of one or more of the adapter assemblies300. In certain implementations, the circuit board arrangement 360 alsoincludes a third circuit board 360C that is positioned parallel to thefirst circuit board 360A and laterally spaced from the second circuitboard 360B. The second and third circuit boards 360B, 360C also connectto the electrical circuit or component to electrically couple contactassemblies 230 at the second and third circuit boards 360B, 360C to thedata management network.

FIG. 35 illustrates part of a first optical plug connector 180A fullyinserted into one port of one of the adapter assemblies 300 of theadapter block assembly 350 and part of a second optical plug connector180B partially inserted into an opposing port of the adapter assembly300. For ease in viewing, internal components of the plug connectors180A, 180B (e.g., the ferrules) are not shown. The memory 182 of thefirst optical plug connector 180A aligns with the second contactsurfaces 238 of one of the contact assemblies 230 mounted to the adapterassembly 300. Physical contact between the first plug connector 180A(e.g., the memory 182) and the second contact surfaces 238 deflects theextensions 237 of the contact assembly 230 so that the third contactsurfaces 239 touch or swipe along the contact pads of the first circuitboard 360A of the adapter block assembly 350. Accordingly, information(e.g., present detection information and/or PLI) can be communicatedfrom the memory 182 to a data management network.

The second optical plug connector 180B has only been partially insertedinto the respective port 312. The second optical plug connector 180B isnot yet touching the second contact surfaces 238 of the other contactassembly 230 mounted to the adapter assembly 300. Because the plugconnector 180B is not biasing the second contact surfaces 238 towardsthe exterior of adapter assembly 300, the third contact surfaces 239 ofthe other contact assembly 230 are not touching the contact pads 362 onthe second circuit board 360B. Accordingly, the data management networkand/or a local processor can determine that the circuit is open and,thereby, determine that the plug connector 180B is not yet presentwithin the port 312 (i.e., at least not sufficiently present to enablereading of data stored in memory 182 of the second plug connector 180B).

FIGS. 36 and 37 illustrate mounting one of the adapter block assemblies250, 350 to an example tray 400. Other example trays 400′, 610, 800 areillustrated in FIGS. 44, 48, and 56 and discussed herein. Informationabout how such trays (e.g., trays 400, 400′, 600, 1100) can be moveablymounted within a chassis or rack and how such an arrangement can be usedwithin a telecommunications system can be found in U.S. application Ser.No. 14/169,941, filed Jan. 31, 2014, now U.S. Pat. No. 9,128,262 andtitled “Slidable Telecommunications Tray with Cable Slack Management,”the disclosure of which is hereby incorporated herein by reference.Another system including trays on which the adapter blocks and cassettesdisclosed herein can be mounted is disclosed in U.S. application Ser.No. 13/925,375, filed Jun. 24, 2013, now U.S. Pat. No. 9,195,021 andtitled “Slidable Fiber Optic Connection Module with Cable SlackManagement,” the disclosure of which is hereby incorporated herein byreference.

The tray 400 is configured to receive at least one adapter blockassembly 250, 350. In some implementations, the tray 400 also isconfigured to manage optical fibers/cables routed to the ports 212, 312of the adapter block assemblies 250, 350. In the example shown in FIG.36, the tray 400 includes cross-members 403 extending between two siderails 401, 402. A mounting rail 404 extends between the cross-members403. In some implementations, latching fingers 406 extend upwardly fromthe mounting rail 404. The latching fingers 406 are configured to engagethe adapter block assembly 250, 350 to further secure the adapter blockassembly 250, 350 to the tray 400. In certain implementations, twolatching fingers 406 face in opposite directions towards the side rails401, 402. In other implementations, another type of adapter blockassembly securement structure can be disposed at the mounting rail 404.

Mounting structures 405 are provided at the inner sides of the siderails 401, 402. In certain implementations, the mounting structures 405are laterally aligned. The mounting structures 405 are configured toreceive the retention members 259 of the adapter block assemblies 250,350. For example, the mounting structures 405 receive the retentionmembers 259 extending outwardly from the sides 255, 256 of the adapterblock assemblies 250, 350. In an example, each mounting structures 405defines a T-shaped cavity having an open top through which one of theretention members 259 can slide. Each mounting structures 405 alsoincludes a shelf on which the retention member 259 can seat.

In certain implementations, the tray 400 is moveable (e.g., slideable,pivotal, etc.) relative to a frame, rack, cabinet, or other mountingstructure. For example, exterior surfaces of the side rails 401, 402 caninclude guides that interact with guides on the holding structure. Incertain implementations, the tray 400 includes cable management guides420 that form routing paths for optical fibers/cables routed onto thetray 400. The management guides 420 may aid in managing the opticalfibers/cables during movement of the tray 400.

In some implementations, the tray 400 provides an electrical connectionbetween the adapter block assemblies 250, 350 and a data managementnetwork. In some implementations, an electrical circuit (e.g., a secondcircuit board 410) is mounted to the mounting rail 404. For example, themounting rail 404 and/or one or more of the cross-members 403 can definea pocket or channel 407 sized to fit the circuit board 410 (e.g., seeFIG. 36). The circuit board 410 includes connectors (e.g., pinreceptacles) configured to receive the circuit board connectors 265 ofthe printed circuit boards 260, 360 within the adapter block assemblies250, 350. In some implementations, the circuit board 410 extends overthe mounting rail 404 and over at least part of one of the cross-members403 towards an aperture in the second side rail 402 through which thecircuit board 410 can connect to a chassis electrical circuit (e.g.,backplane, cable, etc.).

In other implementations, an electrical cable (e.g., a flexible cable)or other circuit can extend from the chassis electrical circuit, throughthe aperture in the second side rail 402, extend across at least part ofthe cross-members 403, and connect (e.g., via connector 415) to thesecond circuit board 410. A cover 408 can be positioned over thecross-member channel 407 to protect the flex circuit. In an example, thecover 408 can be latched (e.g., using latches 409) other otherwisesecured to the cross-member 403. In certain implementations, the chassiselectrical circuit includes a local processor to manage the dataobtained from the adapter block assemblies 250, 350. In otherimplementations, the chassis electrical circuit includes a data portthrough which the data can be carried to a data management network.

FIGS. 38-48 illustrate an example cassette 500 configured to opticallycouple together first cables 532 and second cables 534. In someimplementations, at least of the first cables 532 and the second cables534 are multi-fiber (e.g., MPO-type) cables. In certain implementations,both the first cables 532 and the second cables 534 are multi-fibercables. In other implementations, the second cables 534 may includesingle-fiber cables. In some implementations, the cassette 500 couples anumber of first cables 532 to a greater number of second cables 534. Inthe example shown, the cassette 500 couples one first cable 532 to theesecond cables 534. In other example, the cassette 500 can couple twofirst cables 532 to three second cables 534. In other implementations,each first cable 523 can be coupled to any desired number of secondcables 534.

The cassette 500 includes a cassette body 510 having a first port end501, a second port end 502, a mounting end 503, a cover end 504, a firstside 505, and a second side 506. The first cables 532 are configured toplug into ports at the first port end 501 and the second cables 534 areconfigured to plug into ports at the second port end 502. In certainimplementations, the ports at the first and second port ends 501, 502are defined by adapter assemblies 512, 514. In certain implementations,the adapter assemblies 512 at the first port end 501 are defined byMPO-type adapter assemblies. In an example, the adapter assemblies 514of the second port end 502 are defined by MPO-type adapter assemblies.In other implementations, however, the adapter assemblies 514 of thesecond port end 502 can be defined by LC-type adapter assemblies orother single-fiber adapter assemblies.

As shown in FIG. 39, the cassette body 510 includes a bottom housing 511having a base 513, a sidewall, and a cover 519 that attaches to thebottom housing 511 to close an interior of the cassette body 510. Thebase 513 defines the mounting end 503 and the cover 519 defines thecover end 504. The adapters 512, 514 are mounted at openings 517 at thefirst and second port ends 501, 502. In certain implementations, theopenings 517 at the first port end 501 are disposed along a rowextending between the first and second sides 505, 506; and the openings517 at the second port end 502 are disposed along another row extendingbetween the first and second sides 505, 506.

As shown best in FIG. 41, the adapter assemblies 512, 514 define a portfor receiving an optical connector plug 180 and include a ferruleassembly 330 mounted opposite the port. In certain implementations, theadapter assemblies 512, 514 include one of the adapter pieces 310A, 310Bof the second example adapter assemblies 300. The adapter piece 310A,310B defines the port 312 for receiving the connector plug 180 at theport ends 501, 502 of the cassette body 511. The ferrule assembly 300mounts to the adapter piece 310A, 310B at the flange 323 or otherportion of the body 311 (e.g., see FIG. 42).

The port of each adapter assembly 512, 514 faces outwardly from therespective port end 501, 502 of the cassette body 510 (FIG. 40). Theferrule assembly 330 faces inwardly towards the interior of the cassettebody 510 (FIG. 40). The ferrule assembly 330 can be spring-biasedtowards the port 312 to engage a ferrule of an optical connector plug180 inserted at the port 312 (FIG. 41). In some implementations, theferrule assembly 330 is pre-cabled with optical fibers. In certainimplementations, the ferrule assembly 330 of at least one adapterassembly 512 can be pre-cabled with optical fibers that extend to theferrule assembly 330 of one or more adapter assemblies 514 as will bedescribed in more detail herein.

As shown in FIG. 41, the ferrule arrangement 330 includes an opticalferrule 331 defining one or more through-passages 332 through which oneor more optical fibers can be mounted. In certain implementations, theferrule 331 also defines pin openings 333 through which pins 335 of apin arrangement 334 can extend. The ferrule arrangement 330 alsoincludes a spring 336 to bias the ferrule 331 towards the port 312 ofthe adapter assembly 512, 514. In the example shown, the spring 336includes two leaf springs 338 extending from a base 337 to interact withthe pin arrangement 334. In other implementations, other types ofsprings can be used to bias the ferrule arrangement 330 towards the port312 of the adapter assembly 512, 514.

In some implementations, adapter assemblies 512 at the first port end501 can be pre-cabled to adapter assemblies 514 at the second port end502. For example, optical fibers 535 (e.g., bare optical fibers) can berouted within the interior of the cassette body 510 between the ferruleassemblies 330 of the adapter assemblies 512, 514. In certainimplementations, portions of the cassette body 510 define bend radiuscontours 515 that facilitate fiber routing within the cassette body 510.For example, portions of the cassette sidewall opposite the portopenings 517 can extend away from the port openings 517 to define aconcave contour facing the port openings 517 (see FIG. 40).

FIG. 40 shows one example routing plan for optically coupling a firstadapter assembly 512 to at least one second adapter assembly 514. In theexample shown in FIG. 40, a first one 512 a of the first adapterassemblies 512 has a port configured to receive a first connector plug532 a. The first one 512 a of the first adapter assemblies 512 alsoincludes a first ferrule arrangement 330 a (see FIGS. 41-42) that ispre-cabled with optical fibers 535 a that are routed to a second ferrulearrangements 330 a′ at one of the second adapter assemblies 514 a. Theoptical fibers 535 a extend from the first ferrule arrangement 330 a,towards one of the bend radius contours 515, loops around towards thesecond side 506 of the cassette body 510, loops around another of thebend radius contours 515, and terminates at the second ferrulearrangement 330 a′.

In some implementations, the cassette body 510 has more second adapterassemblies 514 than first adapter assemblies 512. For example, opticalfibers 535 of each of the first adapter assemblies 512 can be routed totwo or more of the second adapter assemblies 514. In the example shownin FIG. 40, optical fibers 535 of each of the first adapter assemblies512 can be routed to three of the second adapter assemblies 514. Inanother example, optical fibers 535 of two of the first adapterassemblies 512 can be routed to three of the second adapter assemblies514. In other implementations, the cassette 500 can have any desirednumber of first and second adapter assemblies 512, 514.

FIGS. 43 and 43A illustrate one example optical fiber arrangement 535configured to extend between ferrule arrangements 330, 330′ of some ofthe first and second adapter assemblies 512, 514. In the example shown,the optical fiber arrangement 535 extends between the ferrulearrangements 330 of two first adapter assemblies 512 and the ferrulearrangements 330′ of three second adapter assemblies 514. The opticalfiber arrangement 535 includes optical fibers being separated from twogroups 531, 533 of twelve fibers into three groups 536, 537, 538 ofeight optical fibers. Each group 531, 533, 536-538 of optical fibersterminates at one of the ferrule arrangements 330, 330′. In otherimplementations, however, the optical fiber arrangement 535 can extendbetween any desired number of first and second adapter assemblies 512,514.

In certain implementations, each ferrule arrangement 330, 330′ isconfigured to receive a like number of fibers (e.g., to fill fiberreceptacles within the ferrule 331). If the ferrule arrangement 330,330′ is configured to receive fewer fibers of the fiber arrangement 535,then the ferrule arrangement 330, 330′ can receive fiber stubs 539(e.g., dark fibers) so that all through-passages 332 of the ferrule 331are filled. For example, in FIG. 43A, each ferrule arrangement 330, 330′is configured to receive twelve optical fibers. However, the fiberarrangement 535 includes two groups 531, 533 of twelve fibers and threegroups 536-538 of eight fibers. Accordingly, the ferrule arrangements330′ receiving the second groups 536-538 of fibers also receive fourfiber stubs 539. In other implementations, each ferrule arrangement 330,330′ can be configured to receive a greater or lesser number of fibers.

Referring back to FIG. 39, some types of cassettes 500 are configured toobtain data (e.g., PLI) from the connector plugs 532, 534 received atthe ports of the adapter assemblies 512, 514. In certainimplementations, the cassette 500 includes a circuit board 520 that isconfigured to extend over the contact assemblies 230 mounted to theadapter pieces 310A, 310B of the adapter assemblies 512, 514 (see FIGS.39 and 40). Contact pads on the circuit board 520 interface with thecontact assemblies 230 to obtain the data stored at the plug connectors532, 534 received at the ports. A controller (e.g., processor,microprocessor, etc.) can be mounted to the circuit board 520) to managethe information obtained from the contact assemblies 230. In certainimplementations, a circuit board connector extends from the circuitboard 520, through the mounting end 503 or the cover end 504 of thecassette body 510, towards an electrical circuit (e.g., flex circuit,circuit board, etc.) connected to a chassis processor and/or datamanagement network.

Some cassettes 500 are configured to mount to the tray 400 shown inFIGS. 36 and 37. In other implementations, however, the cassette 500 canbe mounted to the tray 400 or any other support structure. For example,FIGS. 44-45 illustrate the cassette 500 mounting to a tray 400′ that issubstantially the same as the tray 400. In the example shown in FIGS.44-45, however, the tray 400′ includes a side rail 402′ having adifferent shape than the side rail 402 of the tray 400. Cable managementguides 420′ of the example tray 400′ also differ from the cablemanagement guides 420 of the tray 400.

In some implementations, the cassette body 510 can define a notchedsection 516 that is configured to seat on the mounting rail 404 of thetray 400, 400′. In certain implementations, latch arms 406 areconfigured to couple to latching shoulders defined by the cassette body510. In other implementations, the cassette body 510 can be otherwisecoupled to the mounting rail 404. In some implementations, the cassettebody 510 includes flanges 518 that extend outwardly from the bottomhousing 511 or cover 519 to seat on one or both of the traycross-members 403 of the tray 400, 400′ (see FIG. 45).

In some implementations, the tray 400′ also can include a second circuitboard 410 and flex cable as described above with respect to tray 400. Inother implementations, the tray 400′ may include another type ofelectrical circuit to receive a circuit board connector extending fromthe circuit board 520 of the cassette 500 to communicate the data storedon the plug connectors 532, 534 to a chassis processor or datamanagement network.

Referring now to FIGS. 46-47, an alternative contact assembly 230′suitable for use in any of the adapter assemblies disclosed herein isshown. The contact assembly 230′ includes a body 231′ holding one ormore contact members 235′. The body 231′ is generally rectangular inshape. The body 231′ does not include an alignment peg for mounting toan adapter (e.g., adapter 210, adapter 310, adapter 310′, etc.). Rather,the body 231′ can define a flat surface facing the adapter. In certainimplementations, the body 231′ includes one or more mounting posts 232′that extend outwardly from the body 231′ to mount to a circuit board(e.g., circuit boards 260, 360, 520). In some implementations, the posts232′ can be snap-fit to the circuit board. In other implementations, theposts 232′ can be soldered to the circuit board. The contact assembly230′ is held within an adapter by holding the circuit board to which thecontact assembly 230′ attaches to the adapter (e.g., with any of theadapter block assembly housings or cassette housings described herein).

A longer section of the contact members 235′ extends from one side ofthe body 231′ and a shorter section of the contact members 235′ extendsfrom an opposite side of the body 231′. The shorter section of eachcontact member 235′ defines a first contact surface 236′. In certainimplementations, the first contact surface 236′ is configured to besoldered or otherwise secured to a circuit board (FIG. 46). For example,the first contact surface 236′ can be generally flat. The longer sectionof each contact member 235′ defines a second contact surface 238′ and athird contact surface 239′. In certain implementations, the longersections of the contact members 235′ are substantially identical to thelonger sections of the contact members 235 of the contact assembly 230.

One example alternative adapter 310′ configured to receive two contactassemblies 230′ is shown in FIG. 47. The alternative adapter 310′includes a body 311′ that defines substantially the same ports 312,apertures 317, and mounting pegs 319 as the body 311 of the adapter 310shown in FIG. 23. However, the mounting recess 315′ of the body 311′differs from the mounting recess 315 of the adapter body 311 in that themounting recess 315′ does not define a second aperture 318. Rather, theflat surface of the contact assembly body 231′ is configured to seat onthe flat surface defined by the mounting recess 315′. The adapter body311′ includes ribs 316 positioned between the third contact surfaces239′. The adapter body 311′ defines a flat region 316′ on which theshort sections of contact members 235′ can seat. The flat region 316′does not include ribs extending between the first contact surfaces 236′.

In accordance with some aspects of the disclosure, some of the adapterblock assemblies disclosed above have heights of no more than 13 mmincluding the adapters, the contact assemblies, the circuit boardassemblies, and any cover assembly or housing assembly. For example,some of the adapter block assemblies have heights of no more than 12.75mm. Certain of the adapter block assemblies have heights of no more than12.5 mm. In an example, certain of the adapter block assemblies haveheights of no more than 12.55 mm. In certain implementations, theadapter assemblies by themselves can have heights of no more than 9.5mm. In an example, certain of the adapter block assemblies by themselvescan have heights of no more than 9.35 mm. In certain implementations,the adapter assemblies by themselves can have heights of no more than 9mm. In certain implementations, the adapter assemblies by themselves canhave heights of no more than 8.5 mm. In certain implementations, theadapter assemblies by themselves can have heights of no more than 8 mm.

FIG. 48 illustrates an example tray arrangement 600 including anotherexample tray 610 to which any of the adapter block assemblies orcassettes disclosed herein can be mounted. A circuit board arrangement620 is configured to mount to the tray 610. The circuit boardarrangement 620 is configured to communicate with components (e.g., acontroller) of the circuit board arrangement of the adapter blockassembly or cassette mounted to the tray 610. The tray 610 is configuredto be slideably mounted to a side plane 640. A flexible cable 630 orother electrical circuit connects the circuit board arrangement 620 ofthe tray 610 to an electrical circuit or local processor located at orconnected to the side plane 640. The tray 610 also can be configured tomanage optical fibers routed to the ports of the adapter block assemblyor cassette mounted to the tray 610.

In the example shown in FIG. 48, the tray 610 includes cross-members 613extending between two side rails 611, 612. A mounting rail 614 extendsbetween the cross-members 613. In some implementations, mounting members616 extend upwardly from the mounting rail 614. The mounting members 616are configured to engage an adapter block assembly or cassette tofurther secure the adapter block assembly or cassette to the tray 610.Mounting structures 615 also are provided at the inner sides of the siderails 611, 612. In certain implementations, the mounting structures 615are laterally aligned with each other and with the mounting members 616.

The mounting rail 614 defines a pocket 617 at which the circuit board620 can be mounted. Connection members 622 are mounted to the circuitboard 620 in alignment with circuit board contact members of the adapterblock assembly/cassette to be mounted to the tray 610. The circuit board620 also includes a connection member 625 at a cross-member 613. Incertain implementations, at least part of the cross-member 613 can alsodefine part of the pocket 617. At least a portion 632 of the flexiblecable 630 can be routed through the second side rail 612, through thepocket 617 along the cross-member 613, to the connection member 625 ofthe circuit board 620. A cover 618 can be mounted to the cross-member613 to cover (e.g., protect) the flexible cable portion 632.

An opposite end 636 of the flexible cable is routed to or through theside plane 640. The side plane 640 defines one or more guide slots 642along which the tray 610 can slide. For example, one of the side rails611, 612 of the tray 610 can slide along one of the guide slots 642. Theflexible cable 630 includes an intermediate length 634 that extendsbetween the side rail 612 of the tray 610 and the side plane 640. Theintermediate length 634 is folded back on itself to accommodate movementof the tray 610 relative to the side plane 640.

FIGS. 49-55 illustrate another example implementation of an adapterblock assembly 700 that holds one or more adapter assemblies 750. Theadapter block assembly 700 has a front 701, a rear 702, a top 703, abottom 704, a first side 705, and a second side 706. The front and rear701, 702 provide access to the ports 753 of the adapter assemblies 750.The sides 705, 706 of the adapter block assembly 700 are configured tomount the adapter block assembly 700 to a tray 800 (FIG. 56) or othermounting structure. For example, each side 705, 706 of the adapter blockassembly 700 can include a retention member 709.

As shown in FIG. 51, the adapter block assembly 700 includes at leastone adapter block arrangement 710, a circuit board 730, and a coverarrangement 760. The adapter block arrangement 710 includes a firstadapter block 710A, a second adapter block 710B, and a joining member720. The joining member 720 couples the first and second adapter blocks710A, 710B together. In other implementations, the adapter blockarrangement 710 can be formed as a single piece. Each adapter block710A, 710B is configured to receive one or more of the adapterassemblies 750.

One example adapter block 710 is shown in FIG. 52. The adapter block 710includes two parallel walls 711 connected by a base 713 and sidewalls714. Each of the walls 711 defines one or more ports 712. Each of thesidewalls 714 defines one of the retention members 709. The adapterblock 710 is configured to receive a cover 760. The walls 711 includesupport surfaces 716 that define cavities 717. Each wall 711 alsodefines openings 718 that pass through the wall 711. Each wall 711 alsodefines notches 719 opening away from the base 713.

The adapter block 710 is configured to hold one or more adapterassemblies 750. As disclosed above, each adapter assembly 750 caninclude two adapter pieces 751 rotated 180° from each other (see FIG.51). One example adapter piece 751 is shown in FIG. 53. The adapterpiece 751 includes a port region 752 defining a port 753. The adapterpiece 751 also includes a shroud 754 extending outwardly from a firstend of the port region 752 away from the port 753. A second end of theport region 752 defines a slot 755 that is sized and configured toreceive the shroud 754 of another adapter piece 751. The shroud 754defines a through-opening or recess 756 at which a contact assembly 230can be disposed.

Each adapter piece 751 includes two pegs 757 extending outwardly fromthe first end of the port region 752 and two pegs 757 extendingoutwardly from the second end of the port region 752. Each adapter piece751 also includes a peg 758 that extends outwardly from the shroud 754or the first end of the port region 752. The pegs 757, 758 align withopenings 759 (FIG. 52) defined in the base 713 of the adapter block 710.In some implementations, the openings 759 aid in positioning the adapterpieces 751 into a proper orientation. For example, the openings 759 canfacilitate mounting the adapter pieces 751 so that all connectorsreceived at the front of the adapter block 710 are keyed by the adapterblock 710 in the same rotational orientation.

The circuit board arrangement 730 includes a first circuit board 730A, asecond circuit board 730B, and a third circuit board 730C (see FIG. 51).The first circuit board 730A attaches to the bottom 704 of the firstadapter block 710A; the second circuit board 730B attaches to the bottom704 of the second adapter block 710B; and the third circuit board 730Cattaches to the top 703 of the joining member 720 and both adapterblocks 710A, 710B. Circuit board connectors 735 extend from the firstand second circuit boards 730A, 730B to the third circuit board 730C toelectrically connect the circuit board arrangement 730. Another circuitboard connector 735 (FIG. 50) extends downwardly from the third circuitboard 730C towards the joining member 720. The circuit board connector735 of the third circuit board 730C is configured to electricallyconnect the circuit board arrangement 730 to a data processing network(e.g., via a tray 400, 400′, 610, 800) as will be disclosed in moredetail herein.

As shown in FIG. 50, the joining member 720 is sized to accommodatepassage of pins of the circuit board connector 735 from the thirdcircuit board 730C therethrough. In some implementations, the joiningmember 720 includes a shroud 725 through which the pins of the connector735 extend. The shroud 725 inhibits damage (e.g., bending, breaking,etc.) to the pins when the adapter block assembly 700 is being mountedto a tray 400, 400′, 610, 800 or other mounting surface. In certainimplementations, the joining member 720 includes two shrouds 725 (e.g.,a forward shroud and a rearward shroud). The circuit board connector 735can extend through either shroud 725 depending on how the printedcircuit board 730 is positioned on the adapter block assembly 700.

Furthermore, the adapter block 710 can be positioned on a tray (e.g.,tray 610 of FIG. 48) in one of two positions. For example, the adapterblock 710 can be positioned on the tray 610 so that a first connectionmember 622 on the circuit board 620 seats in the first shroud 725 and asecond connection member 622 on the circuit board 620 seats in thesecond shroud 725. In other implementations, the adapter block 710 canbe flipped 180° relative to the tray 610 so that a first connectionmember 622 on the circuit board 620 seats in the second shroud 725 and asecond connection member 622 on the circuit board 620 seats in the firstshroud 725. Of course, the other trays (e.g., tray 800) disclosed hereinalso can include circuit boards with multiple connection members onwhich any of the adapter blocks disclosed herein can seat.

As shown in FIG. 51, the cover arrangement 760 includes a first cover760A, a second cover 760B, and an intermediate cover 770. The first andsecond covers 760A, 760B are disposed over the third circuit board 730Cand coupled to the adapter blocks 710A, 710B as will be disclosed inmore detail herein. The intermediate cover 770 extends over anintermediate portion 736 (FIG. 51) of the third circuit board 730Cbetween the first and second covers 760A, 760B and couples to thejoining member 720. For example, the intermediate cover 770 can defineslots 775 (FIG. 51) into which latching hooks 722 of the joining member720 can snap to secure the intermediate cover 770 to the joining member720. In other implementations, the covers 760A, 760B, 770 can be formedas a single piece.

One example cover 760 is shown in FIGS. 54 and 55. The cover 760includes a body 761 and one or more lugs 763 extending outwardly from aperimeter of the body 761. In an example, the cover body 761 is planarand the lugs 763 extend outwardly from opposite ends of the body 761.The cover body 761 also includes side pegs 762 and end pegs 764extending downwardly. In certain implementations, the end pegs 764extend downwardly from support blocks 767. The cover body 761 isconfigured to seat on the on the support surfaces 716 and sidewalls 714of the adapter block 710. The side pegs 762 extend through cavities 715defined in the sidewalls 714. The end pegs 764 extend through cavities717 defined in the support surfaces 716. The lugs 763 snap into theopenings 718 defined in the walls 711.

In some implementations, the cover 760 includes one or more lightindicators 769 that are disposed along the ends of the body 761. Thelight indicators 769 align with the ports 712 of the adapter block 710when the cover 760 is mounted to the adapter block 710. For example, thelight indicators 769 can seat in the open-ended notches 719 defined inthe walls 711 of the adapter 710. The light indicators 769 areconfigured to glow or otherwise emit light to indicate a particular oneof the ports 712.

In some implementations, the light indicators 769 include light pipes765 that direct the light from a light source towards a user (see FIG.54). For example, the light pipes 765 can be configured to direct lightfrom one or more LEDs mounted to the third circuit board 730C towards auser. In certain implementations, the light pipes 765 include angledregions 766 to direct the light from an upwardly emitting LED outwardlytowards distal ends 768 of the light pipes 765. In the example shown,the angled regions 766 each define a 45° angle that receives theupwardly emitted light from the LED and directs the light towards thedistal ends 768 of the light pipes 765 (FIG. 55).

In certain implementations, the light pipes 765 extend outwardly fromthe cover body 761 to bulbous or otherwise enlarged ends 768. In anexample, each light pipe end 768 forms a semi-circle. In anotherexample, each light pipe end 768 can form a full circle. In still otherimplementations, the outward ends 768 of the light pipes 765 can haveany desired shape.

FIG. 56 illustrates another example tray 800 to which any of the adapterblock assemblies or cassettes disclosed herein can be mounted. A circuitboard arrangement is configured to mount to the tray 800. The circuitboard arrangement is configured to communicate with components (e.g., acontroller) of the circuit board arrangement of the adapter blockassembly or cassette mounted to the tray 800. The tray 800 is configuredto be slideably mounted to a side plane. A flexible cable or otherelectrical circuit connects the circuit board arrangement of the tray800 to an electrical circuit or local processor located at or connectedto the side plane. The tray 800 also can be configured to manage opticalfibers routed to the ports of the adapter block assembly or cassettemounted to the tray 800.

In the example shown in FIG. 56, the tray 800 includes cross-members 803extending between two side rails 801, 802. A mounting rail 804 extendsbetween the cross-members 803. In some implementations, mounting members806 extend upwardly from the mounting rail 804. The mounting members 806are configured to engage any of the adapter block assemblies orcassettes to further secure the adapter block assembly or cassette tothe tray 800. Mounting structures 805 also are provided at the innersides of the side rails 801, 802. In certain implementations, themounting structures 805 are laterally aligned with each other and withthe mounting members 806.

FIGS. 57-63 illustrate another example cassette 900 suitable formounting to a tray 400, 400′, 610, 800 or other mounting structure. Thecassette 900 is configured to couple together first multi-fiber cablesand second cables (multi-fiber cables or single-fiber cables). In someimplementations, the cassette 900 couples a number of first cables to agreater number of second cables. In an example, the cassette 900 isconfigured to couple each first cable to thee second cables. In anotherexample, the cassette 900 couples each pair of first cables to threesecond cables. In other implementations, each first cable is coupled toany desired number of second cables.

The cassette 900 has a first port end 901, a second port end 902, afirst side 905, and a second side 906. The first cables are configuredto plug into ports 753 at the first port end 901 and the second cablesare configured to plug into ports 753 at the second port end 902. Atleast one port 753 is defined at the first port end 901 and at least oneport 753 is disposed at the second port end 902. In the example shown,two ports 753 are defined at the first port end 901 and six ports 753are disposed at the second port end 902.

In some implementations, the ports 753 at the first and second port ends901, 902 are defined by half-adapter assemblies 940. As shown in FIG.62, each half-adapter assembly 940 includes an adapter piece 751 (FIG.53), a contact assembly 230, and a ferrule arrangement 945. The adapterpiece 751 defines the port 753 accessible from an exterior of thecassette 900. The ferrule arrangement 945 includes a ferrule 942,alignment pins 944, a carriage 946, and a spring 948. The ferrule 942holds internal optical fibers 970; and the spring 948 biases the ferrule942 towards the port 753 of the adapter piece 751. Accordingly, theferrule arrangement 945 and adapter piece 751 cooperate to opticallycouple the internal optical fibers 970 to optical fibers of any cableplugged into the respective port 753.

The internal optical fibers 970 optically couple each ferrulearrangement 945 at the first port end 901 of the cassette 900 to one ormore ferrule arrangements 945 at the second port end 902. In certainimplementations, one set of internal optical fibers 970 can opticallycouple at least one ferrule arrangement 945 at the first port end 901 tothree ferrule arrangements 945 at the second port end 902. For example,a set of twenty-four internal fibers 970 can be routed from a ferrule942 at the first port end 901 into three groups of eight fibers witheach group being routed to a respective ferrule 942 at the second portend 902. In an example, one set of internal optical fibers 970 canoptically couple a pair of ferrule arrangements 945 at the first portend 901 to three ferrule arrangements 945 at the second port end 902.

In some implementations, the internal optical fibers 970 are looseoptical fibers. In other implementations, the internal optical fibers970 include a flex cable 971 (see FIG. 58). A flex cable 971 includes acable formed by lacing optical fibers 970 on a sticky foil or otherflexible substrate. For example, a machine can automatically arrange theinternal optical fibers 970 on the foil into a particular configuration(e.g., having a particular polarity) to form the flex cable 971. Theflex cable 971 is disposed within the cassette 900 so that a first end974 is routed to a ferrule arrangement 945 at the first port end 901 anda second end 977 is routed to a ferrule arrangement 945 at the secondport end 902. In certain implementations, loose fibers stubs 973, 976can extend outwardly from transition points 972, 975, respectively, ofthe flex cable 971. In such implementations, the distal ends 974, 977 ofthe fiber stubs 973, 976, respectively, are taped or otherwise organizedfor insertion into the ferrules 942.

As shown in FIG. 59, a circuit board 930 is disposed within the cassette900 in electrical connection with contact assemblies 230 on thehalf-adapter assemblies 940. For example, the circuit board 930 extendsover the half-adapter assemblies 940 so that contact assemblies 230disposed on the half-adapter assemblies 940 are electrically connectedto the circuit board 930 (e.g., by touching contact pads on the board930). In certain implementations, each half-adapter assembly 940includes only one contact assembly 230. Because the internal opticalfibers 970 optically couple the ferrule arrangements 945 at the firstand second port ends 901, 902, the adapter pieces 751 at the first andsecond ports 901, 902 can be oriented in the same direction.

Accordingly, a single circuit board 930 can contact all of the contactassemblies 230. The circuit board 930 includes a circuit board connectorthat extends through an opening 908 (FIG. 61) in the cassette 900 toplug into a circuit on the tray 400, 400′, 610, 800 to providecommunication to a distribution network.

As shown in FIGS. 58 and 59, the cassette 900 includes a cassette body910 and a cover 950 that cooperate to hold the half-adapter assemblies940. The cassette body 910 includes a peripheral wall 912 extendingupwardly from a base 911. The base 911 defines a recessed section 913that facilitates mounting the cassette 900 to the mounting bar of a tray(e.g., bar 804 of tray 800). The body 910 also includes a retentionarrangement 914 at each side 905, 906 to secure the cassette 900 to themounting structures of the tray (e.g., mounting structure 805 of tray800). The body 910 also includes flanges 915 that extend outwardly fromthe first port end 901 to seat on one of the cross-members of the tray(e.g., cross-member 803 of tray 800).

Port openings 916 are defined in the peripheral wall 912 of the cassettebody 910 to provide access to the ports 753 of the half-adapterassemblies 940. The base 911 of the cassette body 910 defines pegopenings 909 (FIG. 59) sized and arranged to receive the pegs 757, 758of the adapter piece 751 of the half-adapter assembly 940. The cassettebody 910 includes an adapter cradle 920 at each port opening 916. Ahalf-adapter assembly 940 can be mounted at each adapter cradle 920 (seeFIG. 59).

As shown in FIG. 61, each adapter cradle 920 includes a first section921 facing an interior of the cassette 900 and a second section 925facing the port opening 916. The first section 921 defines a cavity 922,vertical channels 923 at one end, and an inwardly-extending ridge 924 atan opposite end of the first section 921. The spring 948 of thehalf-adapter assemblies 940 is held at the vertical channels 923 of thefirst section 921 of the cradle 920. Each adapter cradle 920 alsoincludes a second section 925 including two upwardly-extending latchingfingers 926. The ferrule 942 of a ferrule arrangement 945 can be held atthe latching fingers 926 of the second section 925 of the cradle 920. Aridge on the ferrule 942 abuts the inwardly-extending ridge 924 at thefirst section 921 to limit movement of the ferrule 942 towards the portopening 916.

In FIG. 61, an example half-adapter assembly 940 is disposed at theright-most port opening 916 at the second port end 902. Empty cradles920 are located at the third port opening 916 from the right at thesecond port end 902 and at the left-most port opening 916 at the firstport end 901. A ferrule arrangement 945 is disposed at the right-mostport opening 916 at the first port end 901. Various components ofhalf-adapter assemblies 940 are disposed at the remaining port openings916.

As shown in FIG. 59, the half-adapter assemblies 940 are sandwichedbetween the cassette body 910 and the circuit board 930. The circuitboard 930 includes a body 931 defining peg holes 932 that are sized andconfigured to receive the pegs 757, 758 of the adapter piece 751 of thehalf-adapter assemblies 940. The peg holes 932 aid in aligning thecircuit board 930 relative to the half-adapter assemblies 940, whichaligns the contact assemblies 230 with contacts pads on the body 931 ofthe board 930. In the example shown, both the base 911 and the circuitboard 930 define openings 909, 932 that receive both pegs 757 andalignment peg 758. Accordingly, the adapter piece 751 can be mounted tothe cassette body 910 in either orientation (e.g., shroud-up orshroud-down).

As shown in FIG. 60, the cassette body 910 and cover 950 are configuredto fit together to form the cassette 900. The cover 950 retains thecircuit board 930 and half-adapter assemblies 940 within the cassettebody 910. The cassette body 910 includes pillars 927 disposed about aninterior of the peripheral wall 912. Latch hooks 928 extend inwardlyfrom a top of the peripheral wall 912. The cover 950 includes a body 951that is sized to extend over an open top of the cassette body 910. Thecover body 951 is sized to seat on the pillars 927 within the peripheralwall 912 of the cassette body 910. The latch hooks 928 of the cassettebody 910 snap into notches 952 provided along a peripheral edge of thebody 951 to hold the cover 950 to the cassette body 910.

In some implementations, retention flanges 929 extend upwardly from thebase 911 between the port openings 916. Latching arms 953 extenddownwardly from the cover body 951. Latching hooks 954 extend inwardlyfrom distal ends of the latching arms 953. The latching hooks 954 areconfigured to catch on the retention flanges 929 of the cassette body910. In certain implementations, the latching arms 953 and retentionflanges 929 cooperate to reduce movement of the cover 950 away from thecassette body 910 even when the contact assemblies 230 push upwardlyagainst the circuit board 930 (e.g., when a plug connector is receivedat the port), which pushes upwardly against the cover 950.

As shown in FIGS. 59-61, the cassette body 910 also includes fiberrouting structures that facilitate routing the internal optical fibers970 within the cassette 900. For example, the fiber routing structuresprovide bend radius limiting for the internal optical fibers 970 routedbetween the ferrule arrangements 950 at the first and second port ends901, 902. In the example shown, the cassette body 910 includes routingflanges 918 configured to lead the internal fibers 970 from the ferrulearrangements 945 at the first port end 901 towards one side of thecassette 900. The internal optical fibers 970 are routed to a fiberspool 917 for redirection towards the port openings 916 at one side ofthe second port end 902. Slack fiber length also can be stored at thespool 917. Radius limiters 919 aid in directing the internal fibers 970to the ferrule arrangements 945 at the second port end 902. A

s shown in FIG. 58, a fiber spool arrangement 960 can be disposed withinthe cassette 900. For example, a fiber spool arrangement 960 can bemounted at each fiber spool 917. In certain implementations, each fiberspool arrangement 960 includes a spool 961 that fits with the fiberspool 917. A flange 962 extends from a top of the spool 961 to aid inseparating the internal fibers 970 from the circuit board 930. Two arms963 extend outwardly from opposite sides of the spool 961. A bend radiuslimiter 964 can be provided at a distal end of each arm 963. The spool961 and bend radius limiters 964 can define a storage space in which theinternal optical fibers 970 can be routed.

In some implementations, the fiber spool arrangement 960 is utilizedwith loose internal fibers 970. In other implementations, the fiberspool arrangement 960 is utilized with a flex circuit cable 971. In somesuch implementations, the arms 963 of the fiber spool arrangement 960are located sufficiently towards the bottom of the spool 961 to pressagainst the transition points 972, 975 of the flex cable 971.Accordingly, the arms 963 can inhibit curling of the flex cable 971 atthe transition points 972, 975.

FIGS. 64-70 illustrate another example cassette 1000 suitable formounting to a tray 400, 400′, 610, 800 or other mounting structure. Thecassette 1000 is configured to couple together first multi-fiber cablesand second cables (multi-fiber cables or single-fiber cables). In someimplementations, the cassette 1000 couples a number of first cables to agreater number of second cables. In an example, the cassette 1000 isconfigured to couple each first cable to thee second cables. In anotherexample, the cassette 1000 couples each pair of first cables to threesecond cables. In other implementations, each first cable is coupled toany desired number of second cables.

The cassette 1000 includes a body 1007 having a first port end 1001, asecond port end 1002, a top 1003 (FIG. 64), a bottom 1004 (FIG. 65), afirst side 1005, and a second side 1006. At least one port 1026 isdefined at the first port end 1001 and at least one port 1027 isdisposed at the second port end 1002. One or more first cables areconfigured to plug into the one or more ports 1026 at the first port end1001 and one or more second cables are configured to plug into the oneor more ports 1027 at the second port end 1002. In the example shown,two ports 1026 are defined at the first port end 1001 and six ports 1027are disposed at the second port end 1002.

The cassette body 1007 includes a retention arrangement 1008 at eachside 1005, 1006 to secure the cassette 1000 to the mounting structuresof the tray (e.g., mounting structure 805 of tray 800). The body 1007has mounting structure 1009 at the bottom 1004 of the cassette 1000 tofacilitate mounting the cassette 1000 to the tray (see FIG. 65). In someimplementations, the mounting structure 1009 includes a channel 1013defined through a portion of the cassette body 1007. The cassette body1007 is mounted to the tray so that a portion of the tray extendsthrough one or more channels 1013.

As shown in FIG. 65, a mounting opening 1014 and at least one connectoropening 1015 lead from the bottom 1004 of the cassette body 1007 intothe interior of the cassette 1000. Latches or other connectionstructures on the tray extend upwardly through the mounting opening 1014to secure the cassette 1000 to the tray. Interior electrical (e.g.,electronic) circuitry within the cassette 1000 connects to electricalcircuitry on the tray through the connector openings 1015. In theexample shown, two connector openings 1015 extends into the cassetteinterior from the channel 1013. In certain examples, a shroud may extenddownwardly from each connector opening 1015 to protect a connectorextending through the opening 1015. In certain examples, the mountingopening 1014 and the at least one connector opening 1015 are disposedwithin the channel 1013.

In some implementations, the cassette body 1007 includes a connectionsection 1010 and at least one fiber management section 1011 (see FIG.64). In certain examples, the cassette body 1007 includes multiple fibermanagement sections 1011. In certain examples, the fiber managementsections 1011 extend from both sides of the connection section 1010. Forexample, in certain implementations, one fiber management section 1011extends in a first direction and another fiber management section 1011extends in a second direction. In the example shown, first and secondfiber management sections 1011 extend from outer locations of the firstport end 1001 and a third fiber management section 1011 extends from anintermediate location of the second port end 1002.

In certain examples, the fiber management sections 1011 are thinner thanthe connection section 1010. In an example, the top 1003 of each fibermanagement section 1011 is substantially parallel with the top 1003 ofthe connection section 1010. In an example, the bottom 1004 of eachfiber management section 1011 is substantially parallel with the bottom1004 of the connection section 1010.

FIG. 66 illustrates example optical components disposed within thecassette 1000. For example, a circuit board 1021 and one or more opticaladapters 1025 are disposed within the cassette body 1007. For example,the circuit board 1021 and the optical adapters 1025 may be disposedwithin the connection section 1010 of the cassette body 1007. In certainimplementations, one or more branching devices (e.g., for signalmonitoring) can be disposed within the cassette body 1007. In certainimplementations, one or more optical taps (e.g., for signal monitoring)can be disposed within the cassette body 1007.

The optical adapters 1025 define the cassette ports 1026, 1027 at thefirst and second ports ends 1001, 1002, respectively, of the cassette1000. In some implementations, the optical adapters 1025 are positionedand oriented within the cassette body 1007 so that each optical adapter1025 has an exterior port (i.e., a port accessible from an exterior ofthe cassette body 1007) and an interior port 1028 (i.e., a portaccessible from an interior of the cassette body 1007). In an example,the optical adapters 1025 do not extend beyond the cassette body 1007.

As shown in FIG. 67, optical fibers (e.g., loose fibers, flex-foilfibers, etc.) are routed between the interior ports 1028 of the opticaladapters 1025 to create optical connections between optical connectorsplugged into the exterior ports of the adapters 1025. For example, afirst optical adapter 1025 may define a port 1026 at the first port end1001 of the cassette body 1007 and at least two optical adapters 1025may define ports 1027 at the second port end 1002 of the cassette body1007. Optical fibers may be routed from an interior port 1028 of thefirst optical adapter 1025 at the first connection end 1001 to theinterior ports 1028 of the two optical adapters 1025 at the secondconnection end 1002.

In an example, optical fibers may be routed from the interior port 1028of the first optical adapter 1025 to interior ports 1028 of threeoptical adapters 1025 defining ports 1027 at the second port end 1002(e.g., see FIG. 67). In another example, optical fibers may be routedfrom the interior ports of two optical adapters 1025 defining ports 1026at the first port end 1001 to interior ports of three optical adapters1025 defining ports 1027 at the second port end 1002.

In some implementations, the optical adapters 1025 include full opticaladapters (e.g., optical adapter 210 of FIG. 2; optical adapter 310 ofFIG. 22; and optical adapter 310′ of FIG. 47). In certainimplementations, multi-fiber connectors 1030 are plugged into theinterior ports 1028 of the optical adapters 1025. In examples, themulti-fiber connectors 1030 differ from conventional multi-fiberconnectors in that they do not include a strain-relief boot (e.g., seeFIG. 66). In an example, the multi-fiber connectors 1030 also do notinclude the ribbed portions of the spring retainers. In examples, themulti-fiber connectors 1030 do not include crimps. In otherimplementations, the optical adapters 1025 include partial opticaladapters (e.g., partial adapter 512, 514 of FIG. 41; and partial adapter751 of FIG. 53).

In some implementations, each of the optical adapters 1025 is configuredto hold a contact assembly (e.g., contact assembly 230 of FIG. 11; orcontact assembly 230′ of FIG. 46) to provide a media reading interfacefor a connector plugged into the exterior port. In some implementations,PLI or other information is obtained from optical connectors received atthe exterior ports 1026, 1027 of the optical adapters 1025. In some suchimplementations, the contact assemblies are disposed at only one end ofthe optical adapters 1025 and a single circuit board 1021 extends acrossthe contact assemblies.

In some implementations, one or more management spools 1040 are disposedwithin the cassette body 1007. For example, the management spools 1040may be disposed in the fiber management sections 1011 of the cassettebody 1007. In the example shown, one fiber management spool 1040 isdisposed in each of the fiber management sections 1011. The managementspools 1040 aid in routing optical fibers between the interior ports1028 of the optical adapters 1025. In an example, the management spools1040 aid in routing loose fibers between management sections 1011. Inanother example, at least portions of the optical fibers can be disposedon a flexible substrate (e.g., a tape, a spool, etc.). The substrateportions extend between the management sections 1011 and the managementspools 1040 within the management sections 1011 manage the portions ofthe optical fibers extending from the substrate. In an example, thesubstrate laterally aligns the optical fibers to lessen the amount ofvertical space needed to accommodate the optical fibers.

Each management spool 1040 includes a bend radius limiter 1041 and oneor more retention flanges 1042 extending outwardly from the bend radiuslimiter 1041 (FIG. 68). In some implementations, the retention flanges1042 extend a common distance from the bend radius limiter 1041. Inother implementations, the retention flanges 1042 extend at varyingdistances. In certain examples, the retention flanges 1042 include longflanges 1043 and short flanges 1044 that are shorter than the longflanges 1043. In other implementations, the retention flanges 1042 mayhave more than two lengths.

As shown in FIG. 67, each fiber management section 1011 of the cassettebody 1007 defines a management region 1045 in which the management spool1040 is disposed to form a routing path through the management region1045. In some implementations, the management spools 1040 are separatelymanufactured components coupled to mounts 1058 within the cassette body1007 (e.g., see FIG. 68). As shown in FIG. 69, each spool 1040 mayinclude a hollow or partially hollow interior 1046 in which the mount1058 can be received. In an example, the spools 1040 are snap-fit to themounts 1058. In an example, the spools 1040 are friction-fit to themounts 1058. In other examples, the spools 1040 can be otherwise coupledto the mounts 1058 (e.g., glued, welded, latched, etc.).

The spools 1040 are sized to fit within the fiber management sections1011. For example, in some implementations, the routing path has aheight that is less than about 0.075 inches. The height of the routingpath is measured between the management region 1045 and one of theretention flanges 1042. In certain implementations, the routing path hasa height that is less than about 0.07 inches. In an example, the routingpath has a height that is about 0.069 inches.

In certain implementations, at least a portion of the periphery 1047 ofthe management section 1011 is rounded or contoured that aids in routingthe optical fibers around the spool 1040 and providing bend radiusprotection to the fibers routed therethrough. In some implementations,the width of the routing path varies through the management section1011. For example, the longer retention flanges 1043 cooperate with theperiphery 1047 of the retention section 1045 to define wider portions1048 of the routing path and the shorter retention flanges 1044cooperate with the periphery 1047 of the retention section 1045 todefine shorter portions 1049 of the routing path (see FIG. 67).

In certain examples, the spools 1040 are oriented so that some of thewider portions 1048 of the routing path are disposed at locations whereoptical fibers cross over each other. For example, the long retentionflanges 1043 of the spool 1045A in FIG. 67 extend over the regions wherethe optical fibers from the optical adapter 1025A cross over opticalfibers from the optical adapter 1025B. The short retention flanges 1044of the spool 1045A extend over regions where optical fibers from onlyone of the optical adapters 1025A, 1025B are routed around the spool1040A.

In certain examples, the spools 1040 are oriented so that the narrowerportions 1049 of the routing path are disposed at locations where theoptical fibers extend generally linearly and the wider portions 1048 aredisposed at locations where the fibers are routed around a curve. Forexample, one of the short retention flanges 1044 extends over a region1049 at which the optical fibers from the optical adapter 1025A extendlinearly from a first retention section 1011A to a second retentionsection 1011B. Some of the long retention flanges 1043 extend over aregion 1048 at which the optical fibers from the optical adapter 1025Acurve around the spool 1045B.

In some implementations, the cassette body 1007 includes a top member1050 and a bottom member 1060. The top and bottom members 1050, 1060cooperate to enclose the optical components within the cassette body1007. In certain implementations, the top and bottom members 1050, 1060cooperate to define port openings through which the port openings 1026,1027 are accessible. In some implementations, each of the top and bottommembers 1050, 1060 defines a portion of the connection section 1010 anda portion of each management section 1011.

Each of the top and bottom members 1050, 1060 includes a base 1051, 1061from which a sidewall 1052, 1062, respectively, extends. The top andbottom members 1050, 1060 include attachment structures that hold thetop and bottom members 1050, 1060 together. For example, in someimplementations, one of the top and bottom members 1050, 1060 includestabs (e.g., latch tabs) 1053 and the other of the top and bottom members1050, 1060 defines openings 1063 to receive the latch tabs 1053. In anexample, the top member 1050 includes the tabs 1053 and the bottommember 1060 defines the openings 1063. In other implementations, the topand bottom members 1050, 1060 can be otherwise attached (e.g., welded,glued, fastened, friction-fit, etc.).

In certain examples, one or more latch arrangements 1055, 1065 aredisposed within the cassette body 1007 to secure the top and bottommembers 1050, 1060 together. In the example shown, the latcharrangements 1055 of the top member 1050 include latch fingers 1056having outwardly directed hooks 1057; and the latch arrangements 1065 ofthe bottom member 1060 include latch fingers 1066 having inwardlydirected hooks 1067. When the top and bottom members 1050, 1060 areassembled, the inwardly directed hooks 1067 snap over the outwardlydirected hooks 1057 to hold the top and bottom members 1050, 1060together.

In certain implementations, the latch arrangements 1055, 1065 aredisposed in the connection section 1010 of the module body 1007.Accordingly, the top and bottom members 1050, 1060 are held together atlocations close to the circuit board 1021 and contact assemblies. Incertain examples, the latch arrangements 1055, 1065 extend between theoptical adapters 1025 (e.g., see FIG. 66). These latching connectionsaid in maintaining contact between the contact assemblies and thecircuit board 1021 during insertion and/or removal of optical connectorsfrom the ports 1026, 1027.

The connection section 1010 of the top member 1050 is configured toreceive the circuit board 1021. For example, the top section 1050includes multiple depressions 1054 sized and located to accommodatecomponents and/or circuitry on the circuit board 1021. In certainexamples, some of the depressions 1054 can be provided between the latcharrangements 1055. The depressions 1054 can be shaped and sized to matchspecific components on the circuit board 1021. In certainimplementations, the circuit board 1021 can include or be electricallycoupled to one or more active circuits (e.g., detectors, monitoringcircuitry).

In certain implementations, one or more light indicators (e.g., LEDs)can be disposed on the circuit board 1021. In some implementations, atleast part of the cassette body 1007 is formed of a transparent materialthrough which light emitted from the light indicator can be viewed. Incertain examples, the light emitted from the light indicators at leastpartly shines out through the ports 1026, 1027. In the example shown,the connection section 1010 defines a recess 1080 aligned with each port1026, 1027 to accommodate the light indicators. In otherimplementations, the cassette body 1007 includes an opaque material anda light transmissible material that forms paths between the lightindicators and an exterior of the cassette 1000. In someimplementations, the management spools 1040 within the cassette 1000extend downwardly from the top of the cassette 1000. For example, incertain implementations, the management sections 1011 of the top member1050 include the mounts 1058 for the management spools 1040. Themanagement spools 1040 couple to the mounts 1058 so that the retentionflanges 1042 are spaced from the management region 1045 of the topmember 1050. Accordingly, when the cassette 1000 is assembled, theoptical fibers are routed between the retention flanges 1042 and the topmember 1050 of the cassette 1000.

In certain examples, one or more guides 1059 can be provided along thefiber routing path to aid in directing the optical fibers. In anexample, the guides 1059 aid in retaining the optical fibers within thebounds of the retention flanges 1042. In some implementations, thecassette 1000 is configured so that each optical fiber wraps no morethan once around a particular management spool 1040. In an example, eachoptical fiber is routed about two spools 1040. In certain examples, theoptical fibers are initially routed through the fiber routing paths sothat the fibers are radially offset from the bend radius limiters 1041of the spools 1040. Accordingly, the fibers have slack length thatallows one or more of the fibers to be reconnectorized or otherwiseoperated on.

The bottom member 1060 is configured to fit with the top member 1050. Asshown in FIG. 70, the bottom member 1060 includes a raised portion 1068sized to accommodate the channel 1013 defined along the bottom exteriorof the cassette 1000. The mounting opening 1014 and the connectoropening(s) 1015 are defined in the raised portion 1068. In certainexamples, the interior entrance 1014′ of the mounting opening 1014 iselongated having rounded edges at opposite ends (e.g., se FIG. 70). Inan example, the exterior entrance of the mounting opening also iselongated with rounded ends. In other examples, the mounting opening1014 is circular (see FIG. 65). In an example, the interior entrance ofthe mounting opening 1014 also is circular.

In some implementations, the bottom member 1060 also includes a cablerouting arrangement 1070 disposed at an exterior thereof. In the exampleshown in FIG. 70, the cable routing arrangement 1070 extends outwardlyfrom the intermediate management section 1011 at the second port end1002 of the cassette 1000. The cable routing arrangement 1070 isconfigured to route optical fibers extending from the ports 1027 at thesecond port end 1002 laterally across the cassette 1000. In an example,the cable routing arrangement 1070 is configured to route optical fibersthat extend from ports 1027 at one side of the second port end 1002towards an opposite side of the second port end 1002.

In some examples, the cable routing arrangement 1070 includes one ormore support flanges 1071 extending outwardly from the bottom member1060. Tabs or flanges 1072 extend upwardly from each support flange 1071to retain optical fibers on the support flange 1071. In an example, thetabs or flanges 1072 are integral with the support flanges 1071 (e.g.,bent distal portions of the support flange 1071). One or more retainingfingers 1073 extend outwardly from the sidewall 1062 of the bottommember 1060 to further define the cable passage through the routingarrangement 1070.

In some implementations, the cable routing arrangement 1070 includes oneor more routing members 1075. Each routing member 1075 includes asupport flange 1071 and at least one retaining finger 1073. In theexample shown in FIG. 70, a routing member 1075 is disposed at oppositesides of the management section 1011 of the second port end 1002. Incertain implementations, the routing member 1075 can support additionalfiber retention devices, such as clips or hooks. In certainimplementations, the routing member 1075 can be slotted to supporttie-wraps or hook-and-loop fasteners.

FIG. 71 illustrates another example tray 1100 to which any of theadapter block assemblies 250, 350, 700 or cassettes 500, 900, 1000disclosed herein can be mounted. The tray 1100 is similar to trays 400,400′, and 600 in that the tray 1100 is configured to be mounted to arack for movement relative to the rack. For example, the tray 1100 canbe slideably mounted to a side plane (e.g., see side rail 640 in FIG.48). A circuit board arrangement is configured to mount to the tray 1100(e.g., see circuit board arrangement 620 of FIG. 48). The circuit boardarrangement is configured to communicate with components (e.g., acontroller) of the circuit board arrangement of the adapter blockassembly or cassette mounted to the tray 1100.

In the example shown in FIG. 71, the tray 1100 includes cross-members1103 that extend between side rails 1101, 1102. The tray 1100 alsoincludes a mounting rail 1104 on which the cassette or adapter blockassemblies seat. In the example shown, the mounting rail 1104 extendsbetween the cross-members 1103. Mounting members 1106 extend upwardlyfrom the mounting rail 1104 to connect to the cassette or adapter blockassembly. The tray 1100 also includes mounting structures 1105 thatengage retention arrangements on the cassettes or adapter blockassemblies.

In some implementations, the cassette body 1007 is shaped to fit on thetray 1100. For example, the cassette body 1007 defines the channel 1013in which the mounting rail 1104 is accommodated. In certainimplementations, the management sections 1011 extending from the firstport end 1001 of the bottom member 1060 define recessed regions 1085that seat on one of the cross-members 1103. The cross-members 1103support the cassette 1000. The channel 1013 and recessed regions 1085enable the cassette 1000 to seat low on the tray 1100. In an example,the channel 1013 and recessed regions 1085 enable a top of the cassette1000 to be no more than flush with the side rail 1102.

FIG. 72 schematically shows an example optical fiber arrangement 1150including a flexible substrate 1151 and multiple optical fibers 1152.The flexible substrate 1151 longitudinally extends from a first end 1153to a second end 1154. The optical fibers 1152 extend longitudinallyacross the flexible substrate 1151. The optical fibers 1152 are disposedon the flexible substrate 1151 so that positions of the optical fibers1152 are fixed relative to the flexible substrate 1151. Examples offlexible substrate 1151 include adhesive tape, foil, or other flexiblematerials.

The optical fibers 1152 extend laterally across the first end 1153 in arow and extend laterally across the second end 1154 in a row. In certainexamples, one or more of the optical fibers 1152 cross-over or otherwiselaterally shift positions at an intermediate region 1155 of the flexiblesubstrate 1151. In certain examples, additional optical fibers 1156 aredisposed on the flexible substrate 1151 along with the optical fibers1152. The additional optical fibers 1156 have first ends that terminateat a location on the flexible substrate 1151. In certainimplementations, the crossing-over and shifting of the optical fibers1152 at the intermediate region 1155 provides room to accommodate theadditional optical fibers 1156.

In some implementations, the optical fibers 1152 extending from thefirst end 1153 of the flexible substrate 1151 are terminated by a singleoptical connector 1157 (e.g., an MPO connector). In an example, theoptical connector 1157 terminates twenty-four optical fibers 1152 (e.g.,arranged in two rows 1157 a, 1157 b of twelve). In another example, theoptical connector 1157 terminates twelve optical fibers 1152. In otherimplementations, the optical fibers 1152 extending from the first end1153 of the flexible substrate 1151 are terminated by multiple (e.g.,two) optical connectors 1157 (e.g., single-fiber connectors ormulti-fiber connectors).

In some implementations, the optical fibers 1152 extending from thesecond end 1154 of the flexible substrate 1151 are terminated bymultiple optical connectors 1158 (e.g., MPO connectors). In an example,the optical fibers 1152 are terminated by two optical connectors 1158.In another example, the optical fibers 1152 are terminated by threeoptical connectors 1158 a, 1158 b, 1158 c. In examples, each of theoptical connectors 1158 receives twelve of the optical fibers 1152. Incertain examples, end of the optical fibers 1152 are ribbonized, coated,or otherwise held together to facilitate connectorization of the opticalfibers 1152. In other implementations, the optical fibers 1152 extendingfrom the second end 1154 of the flexible substrate 1151 are terminatedby multiple single-fiber connectors.

In certain examples, each of the optical connectors 1158 receives atleast one of the optical connectors 1152 and at least one of theadditional optical connectors 1156. In an example, each of the opticalconnectors 1158 a, 1158 b, 1158 c receives eight of the optical fibers1152 and four of the additional optical fibers 1156. In otherimplementations, a first optical connector 1158 a can receive adifferent number of additional optical fibers 1156 from a second opticalconnector 1158 b. In certain examples, end of the additional opticalfibers 1156 are ribbonized, coated, or otherwise held together with thecorresponding ends of the optical fibers 1152 to facilitateconnectorization of the optical fibers 1152.

In certain implementations, the optical fiber arrangement 1150 can bekeyed by color coding one or more of the optical fibers 1152 and/or theadditional optical fibers 1156. For example, one or more of theadditional optical fibers 1156 may be colored differently than the restof the optical fibers 1152 and/or additional optical fibers 1156. In anexample, each connector 1158 a, 1158 b, 1158 c terminates a differentnumber of colored additional optical fibers 1156. For example, the firstoptical connector 1158 a may have a single colored additional opticalfiber; the second optical connector 1158 b may have two coloredadditional optical fibers; and the third optical connector 1158 c mayhave three colored additional optical fibers. In other implementations,other coding sequences may be utilized.

The above specification, examples and data provide a completedescription of the manufacture and use of the composition of theinvention. Since many embodiments of the invention can be made withoutdeparting from the spirit and scope of the invention, the inventionresides in the claims hereinafter appended.

1. (canceled)
 2. An optical cassette comprising: a housing defining aninterior, the housing extending along a depth between a front and arear, the housing also extending along a width between opposite firstand second sides, and the housing extending along a height between abase and a closed top, the interior of the housing being disposed inthree sections, each section being defined by at least one end wallsection extending between oppositely facing sidewall sections, at leastone of the sidewall sections being sufficiently short to provide opencommunication between the three sections; a first plurality of opticaladapters disposed at the front of a first of the sections; a multi-fiberadapter disposed at the rear of a second of the sections; and a secondplurality of optical adapters disposed at the front of a third of thesections.
 3. The optical cassette of claim 2, further comprising a fibermanagement structure disposed within the interior of the housing.
 4. Theoptical cassette of claim 3, wherein the fiber management structure isconfigured to retain one or more loops of optical fiber.
 5. The opticalcassette of claim 4, wherein the fiber management structure includes aspool.
 6. The optical cassette of claim 4, wherein the fiber managementstructure is disposed in the first section.
 7. The optical cassette ofclaim 6, wherein a second fiber management structure is disposed in thesecond section.
 8. The optical cassette of claim 2, further comprising aplurality of contact springs carried with the housing, the contactsprings being aligned with ports of the optical adapters of the firstand second pluralities.
 9. The optical cassette of claim 8, wherein thecontact springs are mounted to a circuit board disposed within thehousing.
 10. The optical cassette of claim 2, wherein the at least oneend wall and the sidewall sections extend upwardly from the base. 11.The optical cassette of claim 2, wherein each of the sections extendsalong a common portion of the width of the housing.
 12. The opticalcassette of claim 2, wherein the second section of the housing isdisposed between the first and third sections along the width of thehousing.
 13. The optical cassette of claim 2, wherein the firstplurality of optical adapters include multi-fiber optical adapters. 14.The optical cassette of claim 2, wherein the multi-fiber adapter is afirst multi-fiber adapter, and wherein the optical cassette furthercomprises a second multi-fiber adapter disposed at the rear of thehousing.
 15. The optical cassette of claim 14, wherein the secondmulti-fiber adapter is disposed at the rear of the second section of thehousing.
 16. The optical cassette of claim 1, wherein the closed top isdefined by a removable cover.
 17. The optical cassette of claim 1,wherein the first plurality of optical adapters are disposed in a row.18. The optical cassette of claim 1, further comprising a securementstructure disposed at the first side of the housing.
 19. The opticalcassette of claim 1, wherein the securement structure is stationaryrelative to the housing.
 20. The optical cassette of claim 1, whereinthe housing is symmetrical about an axis extending along the depth ofthe housing at a midpoint along the width of the housing.
 21. Theoptical cassette of claim 1, wherein the base is contoured to vary aninternal height of the interior of the housing within each section.